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2025 19:39:38 +0000 Message-ID: <2f394a01-1cd9-4719-9394-647d8731cf3f@meta.com> Date: Mon, 12 May 2025 15:39:31 -0400 User-Agent: Mozilla Thunderbird Subject: Re: scheduler performance regression since v6.11 To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, Ingo Molnar , dietmar.eggemann@arm.com, vschneid@redhat.com References: <1e3c711f-8c96-4c39-bbe2-7742940d1d31@meta.com> <20250509194955.GA25798@noisy.programming.kicks-ass.net> <20250512180846.GA25891@noisy.programming.kicks-ass.net> Content-Language: en-US From: Chris Mason In-Reply-To: <20250512180846.GA25891@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BL1PR13CA0206.namprd13.prod.outlook.com (2603:10b6:208:2be::31) To LV3PR15MB6455.namprd15.prod.outlook.com (2603:10b6:408:1ad::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email 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EJzKPU3S9k5PARrjzTlSLU/U48rM2ZnbBcD9PLmlRrKa/4mtgQ0piUYIU3jHoM7l+1z4q4GLteQ pxj+mvXzKR0GSWHX8GDkhvFgb4qSgNkPcpRPuWv2SyPomql+uQmkZrcC9GR0B7nAVs3jhPVAYHw VpzF8hkAJqLXKhOba61p8wgXn8LNINwgyug7D1RbS9wU6QiMlpa/lU/1Zm4SyiRFjBPrcnsu2Aq cXcIF9zAQaNvEN/mIvpF1UxM5tZiU5Nsbecnc7a40dmlKOQZcYdL2BI2B4tjKhEVTusXNM32 X-Proofpoint-GUID: WDkYcmBsR7pBdvmmnuK5qcAOzg-RLauh X-Proofpoint-ORIG-GUID: WDkYcmBsR7pBdvmmnuK5qcAOzg-RLauh X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-12_07,2025-05-09_01,2025-02-21_01 On 5/12/25 2:08 PM, Peter Zijlstra wrote: > On Fri, May 09, 2025 at 09:49:55PM +0200, Peter Zijlstra wrote: >> 152 729288bc6856 kernel/sched: Fix util_est accounting for DELAY_DEQUEUE >> average rps: 1936829.47 >> average rps: 1950715.10 >> >> 153 84d265281d6c sched/pelt: Use rq_clock_task() for hw_pressure >> average rps: 2176857.32 >> average rps: 2223004.23 > > So, a little more data on this. > > The result appears stable, but reverting 729288bc6856 on master does not > seem to cure things. 729288bc6856 is in that section of commits where the regression was ~1/2 as bad. (bad: 1.8M, good: 2M, middle ground: 1.9M) I get the same RPS with and without it. I called it "good" in my bisect run, but I'll take a second pass through those potential suspects and see if the bad really starts there. > > OTOH, switching to performance governor completely cures things here. > > My machine defaults to schedutil governor. > > Chris, can you confirm -- or did we manage to find different issues? My repro script sets to performance w/turbo on as step one. I didn't turbostat my way to making sure both sides were actually running at the same frequency, but I'll check that too. -chris