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Re: Potential scheduler regression

From Ben Guthro <ben@guthro.net>
Newsgroups linux.kernel
Subject Re: Potential scheduler regression
Date 2017-07-07 23:00 +0200
Message-ID <u0Iw1-ON-5@gated-at.bofh.it> (permalink)
References <tZUIW-89P-21@gated-at.bofh.it> <tZVEZ-ke-11@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Wed, Jul 5, 2017 at 12:48 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> On Wed, Jul 05, 2017 at 11:42:46AM -0400, Ben Guthro wrote:
>> Hello,
>>
>> I've been in the process of updating our kernel in our appliance VM
>> from an old LTS kernel (4.1.y) to something a bit more modern (4.9.y)
>> - and ran into a performance regression, when our QA team was running
>> some regression suites.
>>
>>
>> I bisect this behavior to the following commit, introduced in the 4.9
>> merge window:
>>
>
> Could you test a later kernel that includes commit:
>
>   1ad3aaf3fcd2 ("sched/core: Implement new approach to scale select_idle_cpu()")
>

(resend without html)

Apologies on the delay - it took a bit to get the machines, to run the test.

I am happy to report that the kernel at 1ad3aaf3fcd2, seems to regain
performance loss from 1b568f0aab, in our test environment.

Since 4.9 is an LTS kernel - is this appropriate to suggest to be
included in the linux-stable list?

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Thread

Potential scheduler regression Ben Guthro <ben@guthro.net> - 2017-07-05 17:50 +0200
  Re: Potential scheduler regression Peter Zijlstra <peterz@infradead.org> - 2017-07-05 18:50 +0200
    Re: Potential scheduler regression Ben Guthro <ben@guthro.net> - 2017-07-07 23:00 +0200
      Re: Potential scheduler regression Peter Zijlstra <peterz@infradead.org> - 2017-07-10 11:30 +0200
        Re: Potential scheduler regression Greg KH <gregkh@linuxfoundation.org> - 2017-07-10 17:30 +0200
          Re: Potential scheduler regression Ben Guthro <ben@guthro.net> - 2017-07-10 17:50 +0200
            Re: Potential scheduler regression Ingo Molnar <mingo@kernel.org> - 2017-07-11 10:40 +0200
              Re: Potential scheduler regression Greg KH <gregkh@linuxfoundation.org> - 2017-07-11 12:00 +0200
                Re: Potential scheduler regression Ben Guthro <ben@guthro.net> - 2017-07-13 21:30 +0200
                Re: Potential scheduler regression Greg KH <gregkh@linuxfoundation.org> - 2017-07-14 09:00 +0200

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