lkml.org 
[lkml]   [2021]   [Jun]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v2] sched/fair: Age the average idle time
On Tue, 15 Jun 2021 at 22:43, Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Tue, Jun 15, 2021 at 12:16:11PM +0100, Mel Gorman wrote:
> > From: Peter Zijlstra (Intel) <peterz@infradead.org>
> >
> > This is a partial forward-port of Peter Ziljstra's work first posted
> > at https://lore.kernel.org/lkml/20180530142236.667774973@infradead.org/.
>
> It's patches 2 and 3 together, right?
>
> > His Signed-off has been removed because it is modified but will be restored
> > if he says it's still ok.
>
> I suppose the SoB will auto-magically re-appear if I apply it :-)
>
> > The patch potentially matters when a socket was multiple LLCs as the
> > maximum search depth is lower. However, some of the test results were
> > suspiciously good (e.g. specjbb2005 gaining 50% on a Zen1 machine) and
> > other results were not dramatically different to other mcahines.
> >
> > Given the nature of the patch, Peter's full series is not being forward
> > ported as each part should stand on its own. Preferably they would be
> > merged at different times to reduce the risk of false bisections.
>
> I'm tempted to give it a go.. anyone object?

Just finished running some tests on my large arm64 system.
Tbench tests are a mixed between small gain and loss

hackbench shows significant changes in both direction
hackbench -g $group

group tip/sched/core + this patch
1 13.358(+/- 1.82%) 12.850(+/- 2.21%) +4%
4 4.286(+/- 2.77%) 4.114(+/- 2.25%) +4%
16 3.175(+/- 0.55%) 3.559(+/- 0.43%) -12%
32 2.912(+/- 0.79%) 3.165(+/- 0.95%) -8%
64 2.859(+/- 1.12%) 2.937(+/- 0.91%) -3%
128 3.092(+/- 4.75%) 3.003(+/-5.18%) +3%
256 3.233(+/- 3.03%) 2.973(+/- 0.80%) +8%

\
 
 \ /
  Last update: 2021-06-16 17:55    [W:1.061 / U:0.176 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site