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([106.120.127.5]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b4f80181dacsm4336458a12.40.2025.09.01.22.16.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Sep 2025 22:16:16 -0700 (PDT) From: Tingyin Duan To: yu.c.chen@intel.com Cc: aubrey.li@intel.com, bsegall@google.com, cyy@cyyself.name, dietmar.eggemann@arm.com, gautham.shenoy@amd.com, hdanton@sina.com, jianyong.wu@outlook.com, juri.lelli@redhat.com, kprateek.nayak@amd.com, len.brown@intel.com, libo.chen@oracle.com, linux-kernel@vger.kernel.org, mgorman@suse.de, mingo@redhat.com, peterz@infradead.org, rostedt@goodmis.org, sshegde@linux.ibm.com, tim.c.chen@linux.intel.com, tingyin.duan@gmail.com, vernhao@tencent.com, vincent.guittot@linaro.org, vineethr@linux.ibm.com, vschneid@redhat.com, yu.chen.surf@gmail.com, zhao1.liu@intel.com Subject: Re: [RFC PATCH v4 25/28] sched: Skip cache aware scheduling if the process has many active threads Date: Tue, 2 Sep 2025 13:16:08 +0800 Message-ID: <20250902051608.4733-1-tingyin.duan@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <463bc54a283c1b908ea286ce67f301e2d1d39ea1.1754712565.git.tim.c.chen@linux.intel.com> References: <463bc54a283c1b908ea286ce67f301e2d1d39ea1.1754712565.git.tim.c.chen@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Several different test cases with mysql and sysbench shows that this patch causes about 10% performance regressions on my computer with 256 cores. Perf-top shows exceed_llc_nr is high. Could you help to address this problems ?