linux-kernel - Re: smpboot seems to be confused on dual EPYC system

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Message-ID: <CAEJqkghh0_kiRu3xaBSfaNSoJTDgNp1ep-03+XTiF2-_cFjASA@mail.gmail.com>
Date:   Mon, 28 May 2018 00:51:17 +0200
From:   Gabriel C <nix.or.die@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: smpboot seems to be confused on dual EPYC system

2018-05-27 23:22 GMT+02:00 Gabriel C <nix.or.die@...il.com>:
>
> 2018-05-27 22:07 GMT+02:00 Borislav Petkov <bp@...en8.de>:
>>
>> On Sun, May 20, 2018 at 03:23:32PM +0200, Gabriel C wrote:
>> > Hello,
>> >
>> > I have an H11DSi-NT board with 2 *  EPYC 7281 16C/32T CPUs.
>> >
>> > On that box for some reason spmboot things '4' logical packages
>> > are possible.
>>
>> First of all, which kernel?
>
>

Here one box with single socket  with an AMD EPYC 7551P
on H11SSL-NC mobo running kernel 4.16.10:

...
[    0.000000] smpboot: Allowing 128 CPUs, 64 hotplug CPUs
[    0.030000] smpboot: CPU0: AMD EPYC 7551P 32-Core Processor
(family: 0x17, model: 0x1, stepping: 0x2)
[    0.545084] smpboot: Max logical packages: 2
[    0.545084] smpboot: Total of 64 processors activated (255989.37 BogoMIPS)
...

128CPUs for sure not possible and for sure no way to have '2' CPUs installed.