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Wed, 13 May 2026 19:23:00 -0700 (PDT) From: Qing Wang 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 Message-Id: <20260514022252.3555-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Wed, 13 May 2026 at 13:29, K Prateek Nayak 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