From: Mike Galbraith <efault@gmx.de>
To: Atish Patra <atish.patra@oracle.com>,
Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, joelaf@google.com,
brendan.jackman@arm.com, jbacik@fb.com, mingo@redhat.com
Subject: Re: [PATCH RFC 1/2] sched: Minimize the idle cpu selection race window.
Date: Wed, 01 Nov 2017 08:18:03 +0100 [thread overview]
Message-ID: <1509520683.12290.41.camel@gmx.de> (raw)
In-Reply-To: <1509519263.12290.30.camel@gmx.de>
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.
-Mike
next prev parent reply other threads:[~2017-11-01 7:18 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-31 5:27 [PATCH RFC 0/2] Fix race window during idle cpu selection Atish Patra
2017-10-31 5:27 ` [PATCH RFC 1/2] sched: Minimize the idle cpu selection race window Atish Patra
2017-10-31 8:20 ` Peter Zijlstra
2017-10-31 8:48 ` Mike Galbraith
2017-11-01 6:08 ` Atish Patra
2017-11-01 6:54 ` Mike Galbraith
2017-11-01 7:18 ` Mike Galbraith [this message]
2017-11-01 16:36 ` Atish Patra
2017-11-01 20:20 ` Mike Galbraith
2017-11-05 0:58 ` Joel Fernandes
2017-11-22 5:23 ` Atish Patra
2017-11-23 10:52 ` Uladzislau Rezki
2017-11-23 13:13 ` Mike Galbraith
2017-11-23 16:00 ` Josef Bacik
2017-11-23 17:40 ` Mike Galbraith
2017-11-23 21:11 ` Atish Patra
2017-11-24 10:26 ` Uladzislau Rezki
2017-11-24 18:46 ` Mike Galbraith
2017-11-26 20:58 ` Mike Galbraith
2017-11-28 9:34 ` Uladzislau Rezki
2017-11-28 10:49 ` Mike Galbraith
2017-11-29 10:41 ` Uladzislau Rezki
2017-11-29 18:15 ` Mike Galbraith
2017-11-30 12:30 ` Uladzislau Rezki
2017-10-31 5:27 ` [PATCH DEBUG 2/2] sched: Add a stat for " Atish Patra
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