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Thu, 06 Aug 2026 06:04:25 -0700 (PDT) From: Kayra Cizmeci To: vineethr@linux.ibm.com Cc: bsegall@google.com, dietmar.eggemann@arm.com, juri.lelli@redhat.com, kprateek.nayak@amd.com, linux-kernel@vger.kernel.org, mgorman@suse.de, mingo@redhat.com, peterz@infradead.org, rostedt@goodmis.org, sh@gentwo.org, vincent.guittot@linaro.org, vschneid@redhat.com, Kayra Cizmeci Subject: Re: [PATCH] sched/fair: Let sync wakeups target the waker's core Date: Thu, 6 Aug 2026 16:03:24 +0300 Message-ID: <20260806130326.79538-1-kayracizmeci@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260801035532.260625-1-vineethr@linux.ibm.com> References: <20260801035532.260625-1-vineethr@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Vineeth, Since all the numbers on this thread are from POWER, I ran this on x86 (Zen 3). I ran the test 3 times on both baseline and baseline + patch. I first got the baseline from 0d83957076 that was like that: =num===cycles===cache-misses= [ 1: 11266587459: 19064897 ] [ 2: 11329575367: 18860444 ] [ 3: 11283159019: 19121436 ] Then, I got the 0d83957076 + this patch: =num===cycles===cache-misses= [ 1: 11128721747: 19886131 ] [ 2: 11163014797: 20019508 ] [ 3: 11111832330: 19764849  ] I tested them with AMD Ryzen 7 5700X 8 Cores, 16 Threads or by other means SMT2. Busybox, minimal initramfs and perf or to be more specific, this command: perf stat -r 10 -e cycles,cache-misses perf bench sched pipe There is a 1.40% decrease of cycles baseline to this patch while there is a 4.60% increase in cache-misses. Both of these values are average values of the decrease and the increase. The values also don't overlap. I don't really have explanations for why this values came back like that, I wasn't expecting them to be like this. Especially cache-misses. Tested-by: Kayra Cizmeci Thanks, Kayra