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Date:   Sun, 17 Jul 2022 14:51:22 -0700
From:   Saeed Mahameed <saeedm@nvidia.com>
To:     Tariq Toukan <tariqt@nvidia.com>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Juri Lelli <juri.lelli@redhat.com>,
        Eric Dumazet <edumazet@google.com>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        Gal Pressman <gal@nvidia.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next 2/2] net/mlx5: Improve remote NUMA preferences
 used for the IRQ affinity hints
Message-ID: <20220717215122.7bw7dwbq43jcm5hz@sx1>
References: <20220717052301.19067-1-tariqt@nvidia.com>
 <20220717052301.19067-3-tariqt@nvidia.com>
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On 17 Jul 08:23, Tariq Toukan wrote:
>In the IRQ affinity hints, replace the binary NUMA preference (local /
>remote) with an improved one that minds the actual distances, so that
>remote NUMAs with short distance are preferred over farther ones.
>
>This has significant performance implications when using NUMA-aware
>allocated memory (follow [1] and derivatives for example).
>
>[1]
>drivers/net/ethernet/mellanox/mlx5/core/en_main.c :: mlx5e_open_channel()
>   int cpu = cpumask_first(mlx5_comp_irq_get_affinity_mask(priv->mdev, ix));
>
>Performance tests:
>
>TCP multi-stream, using 16 iperf3 instances pinned to 16 cores (with aRFS on).
>Active cores: 64,65,72,73,80,81,88,89,96,97,104,105,112,113,120,121
>
>+-------------------------+-----------+------------------+------------------+
>|                         | BW (Gbps) | TX side CPU util | RX side CPU util |
>+-------------------------+-----------+------------------+------------------+
>| Baseline                | 52.3      | 6.4 %            | 17.9 %           |
>+-------------------------+-----------+------------------+------------------+
>| Applied on TX side only | 52.6      | 5.2 %            | 18.5 %           |
>+-------------------------+-----------+------------------+------------------+
>| Applied on RX side only | 94.9      | 11.9 %           | 27.2 %           |
>+-------------------------+-----------+------------------+------------------+
>| Applied on both sides   | 95.1      | 8.4 %            | 27.3 %           |
>+-------------------------+-----------+------------------+------------------+
>
>Bottleneck in RX side is released, reached linerate (~1.8x speedup).
>~30% less cpu util on TX.
>
>* CPU util on active cores only.
>
>Setups details (similar for both sides):
>
>NIC: ConnectX6-DX dual port, 100 Gbps each.
>Single port used in the tests.
>
>$ lscpu
>Architecture:        x86_64
>CPU op-mode(s):      32-bit, 64-bit
>Byte Order:          Little Endian
>CPU(s):              256
>On-line CPU(s) list: 0-255
>Thread(s) per core:  2
>Core(s) per socket:  64
>Socket(s):           2
>NUMA node(s):        16
>Vendor ID:           AuthenticAMD
>CPU family:          25
>Model:               1
>Model name:          AMD EPYC 7763 64-Core Processor
>Stepping:            1
>CPU MHz:             2594.804
>BogoMIPS:            4890.73
>Virtualization:      AMD-V
>L1d cache:           32K
>L1i cache:           32K
>L2 cache:            512K
>L3 cache:            32768K
>NUMA node0 CPU(s):   0-7,128-135
>NUMA node1 CPU(s):   8-15,136-143
>NUMA node2 CPU(s):   16-23,144-151
>NUMA node3 CPU(s):   24-31,152-159
>NUMA node4 CPU(s):   32-39,160-167
>NUMA node5 CPU(s):   40-47,168-175
>NUMA node6 CPU(s):   48-55,176-183
>NUMA node7 CPU(s):   56-63,184-191
>NUMA node8 CPU(s):   64-71,192-199
>NUMA node9 CPU(s):   72-79,200-207
>NUMA node10 CPU(s):  80-87,208-215
>NUMA node11 CPU(s):  88-95,216-223
>NUMA node12 CPU(s):  96-103,224-231
>NUMA node13 CPU(s):  104-111,232-239
>NUMA node14 CPU(s):  112-119,240-247
>NUMA node15 CPU(s):  120-127,248-255
>..
>
>$ numactl -H
>..
>node distances:
>node   0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
>  0:  10  11  11  11  12  12  12  12  32  32  32  32  32  32  32  32
>  1:  11  10  11  11  12  12  12  12  32  32  32  32  32  32  32  32
>  2:  11  11  10  11  12  12  12  12  32  32  32  32  32  32  32  32
>  3:  11  11  11  10  12  12  12  12  32  32  32  32  32  32  32  32
>  4:  12  12  12  12  10  11  11  11  32  32  32  32  32  32  32  32
>  5:  12  12  12  12  11  10  11  11  32  32  32  32  32  32  32  32
>  6:  12  12  12  12  11  11  10  11  32  32  32  32  32  32  32  32
>  7:  12  12  12  12  11  11  11  10  32  32  32  32  32  32  32  32
>  8:  32  32  32  32  32  32  32  32  10  11  11  11  12  12  12  12
>  9:  32  32  32  32  32  32  32  32  11  10  11  11  12  12  12  12
> 10:  32  32  32  32  32  32  32  32  11  11  10  11  12  12  12  12
> 11:  32  32  32  32  32  32  32  32  11  11  11  10  12  12  12  12
> 12:  32  32  32  32  32  32  32  32  12  12  12  12  10  11  11  11
> 13:  32  32  32  32  32  32  32  32  12  12  12  12  11  10  11  11
> 14:  32  32  32  32  32  32  32  32  12  12  12  12  11  11  10  11
> 15:  32  32  32  32  32  32  32  32  12  12  12  12  11  11  11  10
>
>$ cat /sys/class/net/ens5f0/device/numa_node
>14
>
>Affinity hints (127 IRQs):
>Before:
>331: 00000000,00000000,00000000,00000000,00010000,00000000,00000000,00000000
>332: 00000000,00000000,00000000,00000000,00020000,00000000,00000000,00000000
>333: 00000000,00000000,00000000,00000000,00040000,00000000,00000000,00000000
>334: 00000000,00000000,00000000,00000000,00080000,00000000,00000000,00000000
>335: 00000000,00000000,00000000,00000000,00100000,00000000,00000000,00000000
>336: 00000000,00000000,00000000,00000000,00200000,00000000,00000000,00000000
>337: 00000000,00000000,00000000,00000000,00400000,00000000,00000000,00000000
>338: 00000000,00000000,00000000,00000000,00800000,00000000,00000000,00000000
>339: 00010000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>340: 00020000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>341: 00040000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>342: 00080000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>343: 00100000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>344: 00200000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>345: 00400000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>346: 00800000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>347: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001
>348: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000002
>349: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000004
>350: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000008
>351: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000010
>352: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000020
>353: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000040
>354: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000080
>355: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000100
>356: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000200
>357: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000400
>358: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000800
>359: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00001000
>360: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00002000
>361: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00004000
>362: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00008000
>363: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00010000
>364: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00020000
>365: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00040000
>366: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00080000
>367: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00100000
>368: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00200000
>369: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00400000
>370: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00800000
>371: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,01000000
>372: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,02000000
>373: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,04000000
>374: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,08000000
>375: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,10000000
>376: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,20000000
>377: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,40000000
>378: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,80000000
>379: 00000000,00000000,00000000,00000000,00000000,00000000,00000001,00000000
>380: 00000000,00000000,00000000,00000000,00000000,00000000,00000002,00000000
>381: 00000000,00000000,00000000,00000000,00000000,00000000,00000004,00000000
>382: 00000000,00000000,00000000,00000000,00000000,00000000,00000008,00000000
>383: 00000000,00000000,00000000,00000000,00000000,00000000,00000010,00000000
>384: 00000000,00000000,00000000,00000000,00000000,00000000,00000020,00000000
>385: 00000000,00000000,00000000,00000000,00000000,00000000,00000040,00000000
>386: 00000000,00000000,00000000,00000000,00000000,00000000,00000080,00000000
>387: 00000000,00000000,00000000,00000000,00000000,00000000,00000100,00000000
>388: 00000000,00000000,00000000,00000000,00000000,00000000,00000200,00000000
>389: 00000000,00000000,00000000,00000000,00000000,00000000,00000400,00000000
>390: 00000000,00000000,00000000,00000000,00000000,00000000,00000800,00000000
>391: 00000000,00000000,00000000,00000000,00000000,00000000,00001000,00000000
>392: 00000000,00000000,00000000,00000000,00000000,00000000,00002000,00000000
>393: 00000000,00000000,00000000,00000000,00000000,00000000,00004000,00000000
>394: 00000000,00000000,00000000,00000000,00000000,00000000,00008000,00000000
>395: 00000000,00000000,00000000,00000000,00000000,00000000,00010000,00000000
>396: 00000000,00000000,00000000,00000000,00000000,00000000,00020000,00000000
>397: 00000000,00000000,00000000,00000000,00000000,00000000,00040000,00000000
>398: 00000000,00000000,00000000,00000000,00000000,00000000,00080000,00000000
>399: 00000000,00000000,00000000,00000000,00000000,00000000,00100000,00000000
>400: 00000000,00000000,00000000,00000000,00000000,00000000,00200000,00000000
>401: 00000000,00000000,00000000,00000000,00000000,00000000,00400000,00000000
>402: 00000000,00000000,00000000,00000000,00000000,00000000,00800000,00000000
>403: 00000000,00000000,00000000,00000000,00000000,00000000,01000000,00000000
>404: 00000000,00000000,00000000,00000000,00000000,00000000,02000000,00000000
>405: 00000000,00000000,00000000,00000000,00000000,00000000,04000000,00000000
>406: 00000000,00000000,00000000,00000000,00000000,00000000,08000000,00000000
>407: 00000000,00000000,00000000,00000000,00000000,00000000,10000000,00000000
>408: 00000000,00000000,00000000,00000000,00000000,00000000,20000000,00000000
>409: 00000000,00000000,00000000,00000000,00000000,00000000,40000000,00000000
>410: 00000000,00000000,00000000,00000000,00000000,00000000,80000000,00000000
>411: 00000000,00000000,00000000,00000000,00000000,00000001,00000000,00000000
>412: 00000000,00000000,00000000,00000000,00000000,00000002,00000000,00000000
>413: 00000000,00000000,00000000,00000000,00000000,00000004,00000000,00000000
>414: 00000000,00000000,00000000,00000000,00000000,00000008,00000000,00000000
>415: 00000000,00000000,00000000,00000000,00000000,00000010,00000000,00000000
>416: 00000000,00000000,00000000,00000000,00000000,00000020,00000000,00000000
>417: 00000000,00000000,00000000,00000000,00000000,00000040,00000000,00000000
>418: 00000000,00000000,00000000,00000000,00000000,00000080,00000000,00000000
>419: 00000000,00000000,00000000,00000000,00000000,00000100,00000000,00000000
>420: 00000000,00000000,00000000,00000000,00000000,00000200,00000000,00000000
>421: 00000000,00000000,00000000,00000000,00000000,00000400,00000000,00000000
>422: 00000000,00000000,00000000,00000000,00000000,00000800,00000000,00000000
>423: 00000000,00000000,00000000,00000000,00000000,00001000,00000000,00000000
>424: 00000000,00000000,00000000,00000000,00000000,00002000,00000000,00000000
>425: 00000000,00000000,00000000,00000000,00000000,00004000,00000000,00000000
>426: 00000000,00000000,00000000,00000000,00000000,00008000,00000000,00000000
>427: 00000000,00000000,00000000,00000000,00000000,00010000,00000000,00000000
>428: 00000000,00000000,00000000,00000000,00000000,00020000,00000000,00000000
>429: 00000000,00000000,00000000,00000000,00000000,00040000,00000000,00000000
>430: 00000000,00000000,00000000,00000000,00000000,00080000,00000000,00000000
>431: 00000000,00000000,00000000,00000000,00000000,00100000,00000000,00000000
>432: 00000000,00000000,00000000,00000000,00000000,00200000,00000000,00000000
>433: 00000000,00000000,00000000,00000000,00000000,00400000,00000000,00000000
>434: 00000000,00000000,00000000,00000000,00000000,00800000,00000000,00000000
>435: 00000000,00000000,00000000,00000000,00000000,01000000,00000000,00000000
>436: 00000000,00000000,00000000,00000000,00000000,02000000,00000000,00000000
>437: 00000000,00000000,00000000,00000000,00000000,04000000,00000000,00000000
>438: 00000000,00000000,00000000,00000000,00000000,08000000,00000000,00000000
>439: 00000000,00000000,00000000,00000000,00000000,10000000,00000000,00000000
>440: 00000000,00000000,00000000,00000000,00000000,20000000,00000000,00000000
>441: 00000000,00000000,00000000,00000000,00000000,40000000,00000000,00000000
>442: 00000000,00000000,00000000,00000000,00000000,80000000,00000000,00000000
>443: 00000000,00000000,00000000,00000000,00000001,00000000,00000000,00000000
>444: 00000000,00000000,00000000,00000000,00000002,00000000,00000000,00000000
>445: 00000000,00000000,00000000,00000000,00000004,00000000,00000000,00000000
>446: 00000000,00000000,00000000,00000000,00000008,00000000,00000000,00000000
>447: 00000000,00000000,00000000,00000000,00000010,00000000,00000000,00000000
>448: 00000000,00000000,00000000,00000000,00000020,00000000,00000000,00000000
>449: 00000000,00000000,00000000,00000000,00000040,00000000,00000000,00000000
>450: 00000000,00000000,00000000,00000000,00000080,00000000,00000000,00000000
>451: 00000000,00000000,00000000,00000000,00000100,00000000,00000000,00000000
>452: 00000000,00000000,00000000,00000000,00000200,00000000,00000000,00000000
>453: 00000000,00000000,00000000,00000000,00000400,00000000,00000000,00000000
>454: 00000000,00000000,00000000,00000000,00000800,00000000,00000000,00000000
>455: 00000000,00000000,00000000,00000000,00001000,00000000,00000000,00000000
>456: 00000000,00000000,00000000,00000000,00002000,00000000,00000000,00000000
>457: 00000000,00000000,00000000,00000000,00004000,00000000,00000000,00000000
>
>After:
>331: 00000000,00000000,00000000,00000000,00010000,00000000,00000000,00000000
>332: 00000000,00000000,00000000,00000000,00020000,00000000,00000000,00000000
>333: 00000000,00000000,00000000,00000000,00040000,00000000,00000000,00000000
>334: 00000000,00000000,00000000,00000000,00080000,00000000,00000000,00000000
>335: 00000000,00000000,00000000,00000000,00100000,00000000,00000000,00000000
>336: 00000000,00000000,00000000,00000000,00200000,00000000,00000000,00000000
>337: 00000000,00000000,00000000,00000000,00400000,00000000,00000000,00000000
>338: 00000000,00000000,00000000,00000000,00800000,00000000,00000000,00000000
>339: 00010000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>340: 00020000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>341: 00040000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>342: 00080000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>343: 00100000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>344: 00200000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>345: 00400000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>346: 00800000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>347: 00000000,00000000,00000000,00000000,00000001,00000000,00000000,00000000
>348: 00000000,00000000,00000000,00000000,00000002,00000000,00000000,00000000
>349: 00000000,00000000,00000000,00000000,00000004,00000000,00000000,00000000
>350: 00000000,00000000,00000000,00000000,00000008,00000000,00000000,00000000
>351: 00000000,00000000,00000000,00000000,00000010,00000000,00000000,00000000
>352: 00000000,00000000,00000000,00000000,00000020,00000000,00000000,00000000
>353: 00000000,00000000,00000000,00000000,00000040,00000000,00000000,00000000
>354: 00000000,00000000,00000000,00000000,00000080,00000000,00000000,00000000
>355: 00000000,00000000,00000000,00000000,00000100,00000000,00000000,00000000
>356: 00000000,00000000,00000000,00000000,00000200,00000000,00000000,00000000
>357: 00000000,00000000,00000000,00000000,00000400,00000000,00000000,00000000
>358: 00000000,00000000,00000000,00000000,00000800,00000000,00000000,00000000
>359: 00000000,00000000,00000000,00000000,00001000,00000000,00000000,00000000
>360: 00000000,00000000,00000000,00000000,00002000,00000000,00000000,00000000
>361: 00000000,00000000,00000000,00000000,00004000,00000000,00000000,00000000
>362: 00000000,00000000,00000000,00000000,00008000,00000000,00000000,00000000
>363: 00000000,00000000,00000000,00000000,01000000,00000000,00000000,00000000
>364: 00000000,00000000,00000000,00000000,02000000,00000000,00000000,00000000
>365: 00000000,00000000,00000000,00000000,04000000,00000000,00000000,00000000
>366: 00000000,00000000,00000000,00000000,08000000,00000000,00000000,00000000
>367: 00000000,00000000,00000000,00000000,10000000,00000000,00000000,00000000
>368: 00000000,00000000,00000000,00000000,20000000,00000000,00000000,00000000
>369: 00000000,00000000,00000000,00000000,40000000,00000000,00000000,00000000
>370: 00000000,00000000,00000000,00000000,80000000,00000000,00000000,00000000
>371: 00000001,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>372: 00000002,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>373: 00000004,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>374: 00000008,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>375: 00000010,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>376: 00000020,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>377: 00000040,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>378: 00000080,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>379: 00000100,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>380: 00000200,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>381: 00000400,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>382: 00000800,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>383: 00001000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>384: 00002000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>385: 00004000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>386: 00008000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>387: 01000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>388: 02000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>389: 04000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>390: 08000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>391: 10000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>392: 20000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>393: 40000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>394: 80000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
>395: 00000000,00000000,00000000,00000000,00000000,00000001,00000000,00000000
>396: 00000000,00000000,00000000,00000000,00000000,00000002,00000000,00000000
>397: 00000000,00000000,00000000,00000000,00000000,00000004,00000000,00000000
>398: 00000000,00000000,00000000,00000000,00000000,00000008,00000000,00000000
>399: 00000000,00000000,00000000,00000000,00000000,00000010,00000000,00000000
>400: 00000000,00000000,00000000,00000000,00000000,00000020,00000000,00000000
>401: 00000000,00000000,00000000,00000000,00000000,00000040,00000000,00000000
>402: 00000000,00000000,00000000,00000000,00000000,00000080,00000000,00000000
>403: 00000000,00000000,00000000,00000000,00000000,00000100,00000000,00000000
>404: 00000000,00000000,00000000,00000000,00000000,00000200,00000000,00000000
>405: 00000000,00000000,00000000,00000000,00000000,00000400,00000000,00000000
>406: 00000000,00000000,00000000,00000000,00000000,00000800,00000000,00000000
>407: 00000000,00000000,00000000,00000000,00000000,00001000,00000000,00000000
>408: 00000000,00000000,00000000,00000000,00000000,00002000,00000000,00000000
>409: 00000000,00000000,00000000,00000000,00000000,00004000,00000000,00000000
>410: 00000000,00000000,00000000,00000000,00000000,00008000,00000000,00000000
>411: 00000000,00000000,00000000,00000000,00000000,00010000,00000000,00000000
>412: 00000000,00000000,00000000,00000000,00000000,00020000,00000000,00000000
>413: 00000000,00000000,00000000,00000000,00000000,00040000,00000000,00000000
>414: 00000000,00000000,00000000,00000000,00000000,00080000,00000000,00000000
>415: 00000000,00000000,00000000,00000000,00000000,00100000,00000000,00000000
>416: 00000000,00000000,00000000,00000000,00000000,00200000,00000000,00000000
>417: 00000000,00000000,00000000,00000000,00000000,00400000,00000000,00000000
>418: 00000000,00000000,00000000,00000000,00000000,00800000,00000000,00000000
>419: 00000000,00000000,00000000,00000000,00000000,01000000,00000000,00000000
>420: 00000000,00000000,00000000,00000000,00000000,02000000,00000000,00000000
>421: 00000000,00000000,00000000,00000000,00000000,04000000,00000000,00000000
>422: 00000000,00000000,00000000,00000000,00000000,08000000,00000000,00000000
>423: 00000000,00000000,00000000,00000000,00000000,10000000,00000000,00000000
>424: 00000000,00000000,00000000,00000000,00000000,20000000,00000000,00000000
>425: 00000000,00000000,00000000,00000000,00000000,40000000,00000000,00000000
>426: 00000000,00000000,00000000,00000000,00000000,80000000,00000000,00000000
>427: 00000000,00000001,00000000,00000000,00000000,00000000,00000000,00000000
>428: 00000000,00000002,00000000,00000000,00000000,00000000,00000000,00000000
>429: 00000000,00000004,00000000,00000000,00000000,00000000,00000000,00000000
>430: 00000000,00000008,00000000,00000000,00000000,00000000,00000000,00000000
>431: 00000000,00000010,00000000,00000000,00000000,00000000,00000000,00000000
>432: 00000000,00000020,00000000,00000000,00000000,00000000,00000000,00000000
>433: 00000000,00000040,00000000,00000000,00000000,00000000,00000000,00000000
>434: 00000000,00000080,00000000,00000000,00000000,00000000,00000000,00000000
>435: 00000000,00000100,00000000,00000000,00000000,00000000,00000000,00000000
>436: 00000000,00000200,00000000,00000000,00000000,00000000,00000000,00000000
>437: 00000000,00000400,00000000,00000000,00000000,00000000,00000000,00000000
>438: 00000000,00000800,00000000,00000000,00000000,00000000,00000000,00000000
>439: 00000000,00001000,00000000,00000000,00000000,00000000,00000000,00000000
>440: 00000000,00002000,00000000,00000000,00000000,00000000,00000000,00000000
>441: 00000000,00004000,00000000,00000000,00000000,00000000,00000000,00000000
>442: 00000000,00008000,00000000,00000000,00000000,00000000,00000000,00000000
>443: 00000000,00010000,00000000,00000000,00000000,00000000,00000000,00000000
>444: 00000000,00020000,00000000,00000000,00000000,00000000,00000000,00000000
>445: 00000000,00040000,00000000,00000000,00000000,00000000,00000000,00000000
>446: 00000000,00080000,00000000,00000000,00000000,00000000,00000000,00000000
>447: 00000000,00100000,00000000,00000000,00000000,00000000,00000000,00000000
>448: 00000000,00200000,00000000,00000000,00000000,00000000,00000000,00000000
>449: 00000000,00400000,00000000,00000000,00000000,00000000,00000000,00000000
>450: 00000000,00800000,00000000,00000000,00000000,00000000,00000000,00000000
>451: 00000000,01000000,00000000,00000000,00000000,00000000,00000000,00000000
>452: 00000000,02000000,00000000,00000000,00000000,00000000,00000000,00000000
>453: 00000000,04000000,00000000,00000000,00000000,00000000,00000000,00000000
>454: 00000000,08000000,00000000,00000000,00000000,00000000,00000000,00000000
>455: 00000000,10000000,00000000,00000000,00000000,00000000,00000000,00000000
>456: 00000000,20000000,00000000,00000000,00000000,00000000,00000000,00000000
>457: 00000000,40000000,00000000,00000000,00000000,00000000,00000000,00000000
>
>Reviewed-by: Gal Pressman <gal@nvidia.com>
>Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
>---
> drivers/net/ethernet/mellanox/mlx5/core/eq.c | 46 ++++++++++++++++++--
> 1 file changed, 43 insertions(+), 3 deletions(-)
>
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
>index 229728c80233..6e239eb02791 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
>@@ -11,6 +11,9 @@
> #ifdef CONFIG_RFS_ACCEL
> #include <linux/cpu_rmap.h>
> #endif
>+#ifdef CONFIG_NUMA
>+#include <linux/sched/topology.h>
>+#endif
> #include "mlx5_core.h"
> #include "lib/eq.h"
> #include "fpga/core.h"
>@@ -806,13 +809,51 @@ static void comp_irqs_release(struct mlx5_core_dev *dev)
> 	kfree(table->comp_irqs);
> }
>
>+static void set_cpus_by_numa_distance(struct mlx5_core_dev *dev, int ncomp_eqs,
>+				      u16 *cpus)
cosmetic comment:

The name of the function doesn't suggest that it has a fallback that
doesn't set cpus by distance ! 
anyways, better if you implement this in two layers:


mlx5_set_cpus_affinity() {
    err = -ERRVAL;

    if (IS_ENABLED(CONFIG_NUMA))
           err = set_cpus_by_numa_distance(...)

    if (err)
        set_cpu_loacal_spread(...);
}

otherwise, 
Acked-by: Saeed Mahameed <saeedm@nvidia.com>

>+{
>+	int i;
>+#ifdef CONFIG_NUMA
>+	cpumask_var_t cpumask;
>+	int first;
>+
>+	if (!zalloc_cpumask_var(&cpumask, GFP_KERNEL)) {
>+		mlx5_core_err(dev, "zalloc_cpumask_var failed\n");
>+		goto err;
>+	}
>+	cpumask_copy(cpumask, cpu_online_mask);
>+
>+	first = cpumask_local_spread(0, dev->priv.numa_node);
>+
>+	for (i = 0; i < ncomp_eqs; i++) {
>+		int cpu;
>+
>+		cpu = sched_numa_find_closest(cpumask, first);
>+		if (cpu >= nr_cpu_ids) {
>+			mlx5_core_err(dev, "sched_numa_find_closest failed, cpu(%d) >= nr_cpu_ids(%d)\n",
>+				      cpu, nr_cpu_ids);
>+
>+			free_cpumask_var(cpumask);
>+			goto err;
>+		}
>+		cpus[i] = cpu;
>+		cpumask_clear_cpu(cpu, cpumask);
>+	}
>+
>+	free_cpumask_var(cpumask);
>+	return;
>+err:
>+#endif
>+	for (i = 0; i < ncomp_eqs; i++)
>+		cpus[i] = cpumask_local_spread(i, dev->priv.numa_node);
>+}
>+
> static int comp_irqs_request(struct mlx5_core_dev *dev)
> {
> 	struct mlx5_eq_table *table = dev->priv.eq_table;
> 	int ncomp_eqs = table->num_comp_eqs;
> 	u16 *cpus;
> 	int ret;
>-	int i;
>
> 	ncomp_eqs = table->num_comp_eqs;
> 	table->comp_irqs = kcalloc(ncomp_eqs, sizeof(*table->comp_irqs), GFP_KERNEL);
>@@ -830,8 +871,7 @@ static int comp_irqs_request(struct mlx5_core_dev *dev)
> 		ret = -ENOMEM;
> 		goto free_irqs;
> 	}
>-	for (i = 0; i < ncomp_eqs; i++)
>-		cpus[i] = cpumask_local_spread(i, dev->priv.numa_node);
>+	set_cpus_by_numa_distance(dev, ncomp_eqs, cpus);
> 	ret = mlx5_irqs_request_vectors(dev, cpus, ncomp_eqs, table->comp_irqs);
> 	kfree(cpus);
> 	if (ret < 0)
>-- 
>2.21.0
>