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From:   Anatoly Pugachev <matorola@gmail.com>
Date:   Thu, 18 Mar 2021 00:58:59 +0300
Message-ID: <CADxRZqx_udmWyfXxeWkMGN+LwND=+QP427oytuLVdHQNVLdL2g@mail.gmail.com>
Subject: Re: [PATCH 0/1] sched/topology: NUMA distance deduplication
To:     Sergei Trofimovich <slyfox@gentoo.org>
Cc:     Valentin Schneider <valentin.schneider@arm.com>,
        John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>,
        debian-ia64 <debian-ia64@lists.debian.org>
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On Thu, Mar 18, 2021 at 12:42 AM Sergei Trofimovich <slyfox@gentoo.org> wrote:
> > > On 3/17/21 8:36 PM, Valentin Schneider wrote:
> > >> I see ACPI in your boot logs, so I'm guessing you have a bogus SLIT table
> > >> (the ACPI table with node distances). You should be able to double check
> > >> this with something like:
> > >>
> > >> $ acpidump > acpi.dump
> > >> $ acpixtract -a acpi.dump
> > >> $ iasl -d *.dat
> > >> $ cat slit.dsl
> > >
> >
>
> Looking at 'arch/ia64/**' NUMA presence is detected by SRAT ACPI
> tables (and generic ACPI also wants SLIT, those probably exist on large
> ia64 boxes?)

hardware is HPE Integrity BL870c i4 nPar, debian sid/unstable ia64
installed (one of the buildd(s) of debian-ports):

mator@lifshitz:~/acpi$ cat slit.dsl
/*
 * Intel ACPI Component Architecture
 * AML/ASL+ Disassembler version 20200925 (64-bit version)
 * Copyright (c) 2000 - 2020 Intel Corporation
 *
 * Disassembly of slit.dat, Wed Mar 17 21:52:16 2021
 *
 * ACPI Data Table [SLIT]
 *
 * Format: [HexOffset DecimalOffset ByteLength]  FieldName : FieldValue
 */

[000h 0000   4]                    Signature : "SLIT"    [System
Locality Information Table]
[004h 0004   4]                 Table Length : 0000003C
[008h 0008   1]                     Revision : 01
[009h 0009   1]                     Checksum : 7B
[00Ah 0010   6]                       Oem ID : "HP    "
[010h 0016   8]                 Oem Table ID : "BL860C-4"
[018h 0024   4]                 Oem Revision : 00000001
[01Ch 0028   4]              Asl Compiler ID : "HP  "
[020h 0032   4]        Asl Compiler Revision : 00000001

[024h 0036   8]                   Localities : 0000000000000004
[02Ch 0044   4]                 Locality   0 : 0A FF 14 FF
[030h 0048   4]                 Locality   1 : FF 0A FF FF
[034h 0052   4]                 Locality   2 : 14 FF 0A FF
[038h 0056   4]                 Locality   3 : FF FF FF 0A

Raw Table Data: Length 60 (0x3C)

    0000: 53 4C 49 54 3C 00 00 00 01 7B 48 50 20 20 20 20  // SLIT<....{HP
    0010: 42 4C 38 36 30 43 2D 34 01 00 00 00 48 50 20 20  // BL860C-4....HP
    0020: 01 00 00 00 04 00 00 00 00 00 00 00 0A FF 14 FF  // ................
    0030: FF 0A FF FF 14 FF 0A FF FF FF FF 0A              // ............