linux-kernel - Re: Potential scheduler regression

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Date:   Wed, 5 Jul 2017 18:48:50 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ben Guthro <ben@...hro.net>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mike Galbraith <efault@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: Potential scheduler regression

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()")