From: Borislav Petkov <bp@alien8.de>
To: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, LKML <linux-kernel@vger.kernel.org>,
Song Liu <song@kernel.org>,
linux-raid@vger.kernel.org, it+linux-x86@molgen.mpg.de
Subject: Re: [regression 5.4.97 → 5.10.24]: raid6 avx2x4 speed drops from 18429 MB/s to 6155 MB/s
Date: Fri, 2 Apr 2021 16:05:54 +0200 [thread overview]
Message-ID: <20210402140554.GG28499@zn.tnic> (raw)
In-Reply-To: <6a1b0110-07f1-8c2e-fc7f-379758dbd8ca@molgen.mpg.de>
On Fri, Apr 02, 2021 at 10:33:51AM +0200, Paul Menzel wrote:
> Dear Linux folks,
>
>
> On an two socket AMD EPYC 7601, we noticed a decrease in raid6 avx2x4 speed
> shown at the beginning of the boot.
>
> 5.4.95 5.10.24
> ----------------------------------------------
> raid6: avx2x4 gen() 18429 MB/s 6155 MB/s
> raid6: avx2x4 xor() 6644 MB/s 4274 MB/s
> raid6: avx2x2 gen() 17894 MB/s 18744 MB/s
> raid6: avx2x2 xor() 11642 MB/s 11950 MB/s
> raid6: avx2x1 gen() 13992 MB/s 17112 MB/s
> raid6: avx2x1 xor() 10855 MB/s 11143 MB/s
Looks like those two might help:
49200d17d27d x86/fpu/64: Don't FNINIT in kernel_fpu_begin()
e45122893a98 x86/fpu: Add kernel_fpu_begin_mask() to selectively initialize state
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2021-04-02 14:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-02 8:33 [regression 5.4.97 → 5.10.24]: raid6 avx2x4 speed drops from 18429 MB/s to 6155 MB/s Paul Menzel
2021-04-02 14:05 ` Borislav Petkov [this message]
2021-04-06 10:58 ` Paul Menzel
2021-04-06 12:41 ` Borislav Petkov
-- strict thread matches above, loose matches on Subject: below --
2021-04-03 12:49 Thomas Backlund
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