From: "Doug Smythies" <dsmythies@telus.net>
To: "'Vincent Guittot'" <vincent.guittot@linaro.org>,
"'Peter Zijlstra'" <peterz@infradead.org>
Cc: "'K Prateek Nayak'" <kprateek.nayak@amd.com>, <mingo@kernel.org>,
<juri.lelli@redhat.com>, <dietmar.eggemann@arm.com>,
<rostedt@goodmis.org>, <bsegall@google.com>, <mgorman@suse.de>,
<vschneid@redhat.com>, <linux-kernel@vger.kernel.org>,
<wangtao554@huawei.com>, <quzicheng@huawei.com>,
<wuyun.abel@bytedance.com>, "Doug Smythies" <dsmythies@telus.net>
Subject: RE: [PATCH 0/4] sched: Various reweight_entity() fixes
Date: Tue, 10 Feb 2026 21:21:24 -0800 [thread overview]
Message-ID: <002501dc9b16$442a7050$cc7f50f0$@telus.net> (raw)
In-Reply-To: <CAKfTPtAhKJ0+4=a27XNbatwYt=4zEnhQNe0NbS3i4WixyoAnbQ@mail.gmail.com>
On 2026.02.10 12:52 Vincent Guittot wrote:
> On Mon, 9 Feb 2026 at 16:47, Peter Zijlstra <peterz@infradead.org> wrote:
>> On Wed, Feb 04, 2026 at 03:45:58PM +0530, K Prateek Nayak wrote:
>
... delete ...
> This patch w/ the patchset on top of tip/sched/core create regressions
> for hackbench (tbench doesn't seem to be impacted) on my dragonboard
> rb5
> All hackbench tests are regressing. Some results below
...
> hackbench 8 group process socket
> 0.650(+/-1%) vs 2.361(+/-8.8%) : -263%
...
Very interesting.
I only know of the Phoronix version of hackbench.
I ran what I believe to be a similar scenario to yours:
10 test runs each (the default is 3):
Kernel 6.19-rc8: 23.228 seconds average, deviation 0.39%
Kernel 6.19-rc8-pz-v2: 85.755 seconds average, deviation 3.33%
269% regression. (very similar to Vicent's results)
System:
Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz, 6 cores 12 CPUs.
CPU frequency scaling driver: intel_pstate.
CPU frequency scaling governor: powersave.
HWP: enabled.
idle governor teo.
next prev parent reply other threads:[~2026-02-11 5:21 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
2026-01-30 9:34 ` [PATCH 1/4] sched/fair: Only set slice protection at pick time Peter Zijlstra
2026-01-30 15:52 ` Vincent Guittot
2026-01-30 9:34 ` [PATCH 2/4] sched/eevdf: Update se->vprot in reweight_entity() Peter Zijlstra
2026-01-30 16:20 ` Vincent Guittot
2026-01-30 9:34 ` [PATCH 3/4] sched/fair: Increase weight bits for avg_vruntime Peter Zijlstra
2026-01-30 9:34 ` [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag") Peter Zijlstra
2026-01-31 1:47 ` Zhang Qiao
2026-01-31 15:21 ` Peter Zijlstra
2026-02-02 9:12 ` Peter Zijlstra
2026-02-02 9:24 ` Peter Zijlstra
2026-02-02 11:23 ` Zhang Qiao
2026-02-01 17:13 ` [PATCH 0/4] sched: Various reweight_entity() fixes Doug Smythies
2026-02-03 6:45 ` K Prateek Nayak
2026-02-03 11:11 ` Peter Zijlstra
2026-02-03 12:19 ` K Prateek Nayak
2026-02-03 16:36 ` Doug Smythies
2026-02-10 18:13 ` Peter Zijlstra
2026-02-11 5:51 ` Doug Smythies
2026-02-04 10:15 ` K Prateek Nayak
2026-02-09 15:47 ` Peter Zijlstra
2026-02-09 16:52 ` K Prateek Nayak
2026-02-10 5:16 ` K Prateek Nayak
2026-02-10 10:29 ` Peter Zijlstra
2026-02-10 15:41 ` Doug Smythies
2026-02-10 18:09 ` K Prateek Nayak
2026-02-10 18:35 ` Peter Zijlstra
2026-02-10 20:04 ` K Prateek Nayak
2026-02-11 6:28 ` K Prateek Nayak
2026-02-11 8:50 ` K Prateek Nayak
2026-02-11 23:09 ` Doug Smythies
2026-02-10 18:52 ` Peter Zijlstra
2026-02-10 20:52 ` Vincent Guittot
2026-02-11 5:21 ` Doug Smythies [this message]
2026-02-11 8:49 ` Vincent Guittot
2026-02-11 9:01 ` Peter Zijlstra
2026-02-11 10:48 ` Peter Zijlstra
2026-02-11 10:49 ` Peter Zijlstra
2026-02-11 11:15 ` Vincent Guittot
2026-02-11 16:28 ` Peter Zijlstra
2026-02-12 7:43 ` K Prateek Nayak
2026-02-12 11:59 ` Peter Zijlstra
2026-02-12 17:16 ` Peter Zijlstra
2026-02-12 17:24 ` Vincent Guittot
2026-02-12 19:31 ` Peter Zijlstra
2026-02-13 5:22 ` K Prateek Nayak
2026-02-13 6:44 ` Peter Zijlstra
2026-02-13 10:50 ` Peter Zijlstra
2026-02-13 14:29 ` K Prateek Nayak
2026-02-14 6:31 ` Doug Smythies
2026-02-21 22:51 ` Doug Smythies
2026-02-12 19:29 ` Peter Zijlstra
2026-02-12 19:37 ` Doug Smythies
2026-02-13 6:04 ` K Prateek Nayak
2026-02-11 16:21 ` Peter Zijlstra
2026-02-12 5:54 ` Doug Smythies
2026-02-12 7:51 ` Peter Zijlstra
2026-02-12 15:47 ` Doug Smythies
2026-02-12 7:46 ` Peter Zijlstra
2026-02-11 23:25 ` Doug Smythies
2026-02-11 8:48 ` Peter Zijlstra
2026-02-04 10:44 ` Peter Zijlstra
2026-02-14 7:20 ` Shubhang Kaushik
2026-02-16 3:14 ` K Prateek Nayak
2026-02-16 10:59 ` Dietmar Eggemann
2026-02-17 14:37 ` Dietmar Eggemann
2026-02-17 22:02 ` Shubhang Kaushik
2026-02-17 4:20 ` K Prateek Nayak
2026-02-18 18:37 ` Shubhang Kaushik
2026-02-19 7:53 ` Peter Zijlstra
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