From: Qing Wang <wangqing7171@gmail.com>
To: kprateek.nayak@amd.com
Cc: bsegall@google.com, chenl311@chinatelecom.cn,
dietmar.eggemann@arm.com, juri.lelli@redhat.com,
linux-kernel@vger.kernel.org, mgorman@suse.de, mingo@redhat.com,
peterz@infradead.org, rostedt@goodmis.org,
vincent.guittot@linaro.org, vschneid@redhat.com,
wangqing7171@gmail.com
Subject: Re: [PATCH] sched/fair: Replace random newidle_balance with Bresenham accumulator
Date: Thu, 14 May 2026 10:22:52 +0800 [thread overview]
Message-ID: <20260514022252.3555-1-wangqing7171@gmail.com> (raw)
In-Reply-To: <da1896b3-6bec-4b56-bf6d-9ce775b00b8d@amd.com>
On Wed, 13 May 2026 at 13:29, K Prateek Nayak <kprateek.nayak@amd.com> wrote:
> I took the most sensitive workload I have for newidle balance (tbench)
> and took it for a spin with these changes. Following are the results:
>
> Clients: tip bresenham_accm
> 1 321.65 (0.00 pct) 313.97 (-2.38 pct)
> 2 641.92 (0.00 pct) 638.74 (-0.49 pct)
> 4 1245.65 (0.00 pct) 1237.26 (-0.67 pct)
> 8 2435.80 (0.00 pct) 2442.23 ( 0.26 pct)
> 16 4717.66 (0.00 pct) 4688.19 (-0.62 pct)
> 32 9303.53 (0.00 pct) 9390.71 ( 0.93 pct)
> 64 18002.57 (0.00 pct) 17911.56 (-0.50 pct)
> 128 27729.26 (0.00 pct) 27621.95 (-0.38 pct)
> 256 47134.77 (0.00 pct) 46137.36 (-2.11 pct)
> 512 43179.41 (0.00 pct) 43277.53 ( 0.22 pct)
> 1024 40339.30 (0.00 pct) 40176.49 (-0.40 pct)
>
> The %diff is in noise range which is a good indication that there
> shouldn't be any surprises. I'll queue a run overnight to see if
> there are other benchmarks that like / dislike these changes.
>
> I'll let Peter comment on the change itself since he knows these
> bits best ;-)
Oh! Thanks for your benchmarks :) The %diff looks good.
Let's wait for Peter's comments.
--
Best regards,
Qing
prev parent reply other threads:[~2026-05-14 2:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20260429085147.1029505-1-wangqing7171@gmail.com>
2026-05-06 2:44 ` [PATCH] sched/fair: Replace random newidle_balance with Bresenham accumulator Qing Wang
2026-05-13 2:21 ` Qing Wang
2026-05-13 5:29 ` K Prateek Nayak
2026-05-14 2:22 ` Qing Wang [this message]
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