linux-kernel - Re: Performance drop on kernel-4.17 visible on Stream, Linpack and NAS parallel benchmarks

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Message-ID: <20180606125009.GA29162@jra-laptop.brq.redhat.com>
Date:   Wed, 6 Jun 2018 14:50:22 +0200
From:   Jakub Racek <jracek@...hat.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: Performance drop on kernel-4.17 visible on Stream, Linpack and
 NAS parallel benchmarks

+++ Rafael J. Wysocki [06/06/18 14:34 +0200]:
>On Wed, Jun 6, 2018 at 2:27 PM, Jakub Racek <jracek@...hat.com> wrote:
>> Hi,
>>
>> There is a huge performance regression on the 2 and 4 NUMA node systems on
>> stream benchmark with 4.17 kernel compared to 4.16 kernel. Stream, Linpack
>> and NAS parallel benchmarks show upto 50% performance drop.
>
>OK, and why do you think that it is related to ACPI?

I don't know where the problems is or who to CC. 

What information should be added? I can probably provide it, if I know
what.

>Thanks,
>Rafael