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 <ZH8YS+LxMM1ZPpsc@feng-clx>
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From:   Chris Bainbridge <chris.bainbridge@gmail.com>
Date:   Tue, 6 Jun 2023 13:28:50 +0100
Message-ID: <CAP-bSRaNQj+fi1r0MZ64wB5_rfjHmEBFQ+QueiNQ9dnyJixG8A@mail.gmail.com>
Subject: Re: PROBLEM: skew message does not handle negative ns skew
To:     Feng Tang <feng.tang@intel.com>
Cc:     paulmck@kernel.org, tglx@linutronix.de, sboyd@kernel.org,
        LKML <linux-kernel@vger.kernel.org>
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On Tue, 6 Jun 2023 at 12:35, Feng Tang <feng.tang@intel.com> wrote:
>
> Hi,
>
> Could you share more info about the hardware, like which generation,
> how many sockets or numa nodes (output of lscpu, 'numactl -h') ?
>
> Thanks,
> Feng

The hardware is a HP Pavilion Aero 13 laptop.

$ lscpu
Architecture:            x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Address sizes:         48 bits physical, 48 bits virtual
  Byte Order:            Little Endian
CPU(s):                  16
  On-line CPU(s) list:   0-15
Vendor ID:               AuthenticAMD
  Model name:            AMD Ryzen 7 5800U with Radeon Graphics
    CPU family:          25
    Model:               80
    Thread(s) per core:  2
    Core(s) per socket:  8
    Socket(s):           1
    Stepping:            0
    Frequency boost:     enabled
    CPU(s) scaling MHz:  35%
    CPU max MHz:         4505.0781
    CPU min MHz:         1600.0000
    BogoMIPS:            3792.93
    Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep
mtrr pge mca cmov
                         pat pse36 clflush mmx fxsr sse sse2 ht
syscall nx mmxext fxsr_
                         opt pdpe1gb rdtscp lm constant_tsc rep_good
nopl nonstop_tsc c
                         puid extd_apicid aperfmperf rapl pni
pclmulqdq monitor ssse3 f
                         ma cx16 sse4_1 sse4_2 movbe popcnt aes xsave
avx f16c rdrand l
                         ahf_lm cmp_legacy svm extapic cr8_legacy abm
sse4a misalignsse
                          3dnowprefetch osvw ibs skinit wdt tce
topoext perfctr_core pe
                         rfctr_nb bpext perfctr_llc mwaitx cpb cat_l3
cdp_l3 hw_pstate
                         ssbd mba ibrs ibpb stibp vmmcall fsgsbase
bmi1 avx2 smep bmi2
                         erms invpcid cqm rdt_a rdseed adx smap
clflushopt clwb sha_ni
                         xsaveopt xsavec xgetbv1 xsaves cqm_llc
cqm_occup_llc cqm_mbm_t
                         otal cqm_mbm_local clzero irperf xsaveerptr
rdpru wbnoinvd cpp
                         c arat npt lbrv svm_lock nrip_save tsc_scale
vmcb_clean flushb
                         yasid decodeassists pausefilter pfthreshold
avic v_vmsave_vmlo
                         ad vgif v_spec_ctrl umip pku ospke vaes
vpclmulqdq rdpid overf
                         low_recov succor smca fsrm
Virtualization features:
  Virtualization:        AMD-V
Caches (sum of all):
  L1d:                   256 KiB (8 instances)
  L1i:                   256 KiB (8 instances)
  L2:                    4 MiB (8 instances)
  L3:                    16 MiB (1 instance)
NUMA:
  NUMA node(s):          1
  NUMA node0 CPU(s):     0-15
Vulnerabilities:
  Itlb multihit:         Not affected
  L1tf:                  Not affected
  Mds:                   Not affected
  Meltdown:              Not affected
  Mmio stale data:       Not affected
  Retbleed:              Not affected
  Spec store bypass:     Mitigation; Speculative Store Bypass disabled via prctl
  Spectre v1:            Mitigation; usercopy/swapgs barriers and
__user pointer saniti
                         zation
  Spectre v2:            Mitigation; Retpolines, IBPB conditional,
IBRS_FW, STIBP alway
                         s-on, RSB filling, PBRSB-eIBRS Not affected
  Srbds:                 Not affected
  Tsx async abort:       Not affected

$ numactl -H
available: 1 nodes (0)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
node 0 size: 15331 MB
node 0 free: 789 MB
node distances:
node   0
  0:  10