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Thu, 29 Jan 2026 20:14:36 -0800 (PST) Message-ID: Date: Thu, 29 Jan 2026 23:14:34 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] sched/fair: Proportional newidle balance To: Peter Zijlstra Cc: Chris Mason , Joseph Salisbury , Adam Li , Hazem Mohamed Abuelfotoh , Josh Don , mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, linux-kernel@vger.kernel.org, kprateek.nayak@amd.com, shubhang@os.amperecomputing.com, arighi@nvidia.com References: <20251107160645.929564468@infradead.org> <20251107161739.770122091@infradead.org> <8760001e-0274-454c-a4e4-1f38a9695b88@gmail.com> <20260123105046.GM171111@noisy.programming.kicks-ass.net> <20260123110306.GA217302@noisy.programming.kicks-ass.net> <20260127104041.GD217302@noisy.programming.kicks-ass.net> <20260127151748.GA1079264@noisy.programming.kicks-ass.net> Content-Language: en-US From: Mario Roy In-Reply-To: <20260127151748.GA1079264@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit I missed stating higher is better for the stress-ng socket tests. For clarity, I find it difficult to know for certain if a scheduler patch is good or bad without the prefer-idle-core results. A fix may resolve an issue. But, only to introduce another. I'm unqualified to know for certain if the fix in question introduces another. Because, of the limited CPU saturation anomaly with EEVDF. EEVDF turns out to be amazing. However, the folks in my circle including myself are constantly worried about the ups and downs with EEVDF. Mainly with the stable kernels. We consider varied testing one way to be certain, including limited CPU saturation testing. Well, a wish request for the test machines to include limited CPU saturation, e.g. 100%, 50%, 31.25%, and 25%. The 25% is helpful in the case the test does 2x the number of given parameter. Plus wanting to be at/below the number of physical cores. Thank you for your efforts with EEVDF.