linux-kernel - Re: [PATCH RFC 1/2] sched: Minimize the idle cpu selection race window.

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Message-ID: <709d5959-6a2d-1757-f453-d258526fdd08@oracle.com>
Date:   Wed, 1 Nov 2017 11:36:25 -0500
From:   Atish Patra <atish.patra@...cle.com>
To:     Mike Galbraith <efault@....de>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, joelaf@...gle.com,
        brendan.jackman@....com, jbacik@...com, mingo@...hat.com
Subject: Re: [PATCH RFC 1/2] sched: Minimize the idle cpu selection race
 window.



On 11/01/2017 02:18 AM, Mike Galbraith wrote:
> On Wed, 2017-11-01 at 07:54 +0100, Mike Galbraith wrote:
>> On Wed, 2017-11-01 at 01:08 -0500, Atish Patra wrote:
>>
>>> Do you have the schbench configuration somewhere that I can test? I
>>> tried various configurations but did not
>>> see any improvement or regression.
>> No, as noted, I didn't save anything.  I watched and fiddled with
>> several configurations on various sized boxen, doing this/that on top
>> of the reservation thing to try to improve the "it's 100% about perfect
>> spread" schbench, but didn't like the pricetag, so tossed the lot over
>> my shoulder and walked away.
:)
> BTW, the biggest trouble with schbench at that time was not so much
> about wakeup time stacking (though it was visible), it was using load
> averages instead of instantaneous state, and sawtoothing therein.
Ahh I see. Any other benchmark suggestion that may benefit from this fix ?

Regards,
Atish
> 	-Mike