lkml.org 
[lkml]   [2017]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH RFC 1/2] sched: Minimize the idle cpu selection race window.
From
Date
On Wed, 2017-11-01 at 01:08 -0500, Atish Patra wrote:
>
> On 10/31/2017 03:48 AM, Mike Galbraith wrote:
>
> > I played with something ~similar (cmpxchg() idle cpu reservation)
> I had an atomic version earlier as well. Peter's suggestion for per cpu
> seems to perform slightly better than atomic.

Yeah, no doubt about that.

> Thus, this patch has the per cpu version.
> > a
> > while back in the context of schbench, and it did help that,
> 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.

-Mike

\
 
 \ /
  Last update: 2017-11-01 07:56    [W:0.086 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site