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Thu, 5 Aug 2021 14:33:53 +0000 From: Rahul Gopakumar To: Valentin Schneider , Abdul Anshad Azeez , "linux-kernel@vger.kernel.org" CC: "peterz@infradead.org" , "mingo@redhat.com" , "juri.lelli@redhat.com" , "vincent.guittot@linaro.org" , "rostedt@goodmis.org" , Rajender M Subject: Re: [Linux Kernel 5.13 GA] ESXi Performance regression Thread-Topic: [Linux Kernel 5.13 GA] ESXi Performance regression Thread-Index: AQHXhTyNLF9o+lnoy02JoxwVp6cTWKtbgqkAgAl6+kk= Date: Thu, 5 Aug 2021 14:33:52 +0000 Message-ID: References: <87a6m4kk4f.mognet@arm.com> In-Reply-To: <87a6m4kk4f.mognet@arm.com> Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: arm.com; dkim=none (message not signed) header.d=none;arm.com; dmarc=none action=none header.from=vmware.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 840f7434-9de2-4c8f-c3ac-08d9581e0c70 x-ms-traffictypediagnostic: BY5PR05MB7076: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:254; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: vmware.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR05MB5206.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 840f7434-9de2-4c8f-c3ac-08d9581e0c70 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Aug 2021 14:33:52.9366 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b39138ca-3cee-4b4a-a4d6-cd83d9dd62f0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: KBFq+vUUfE5XzAoB/i/Bzq5/h7rpGiOkMdLMG0KOzbdNlsB11B+LY0JDpqDGmu9M7hdIStjurz30Ir7J40ywaQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR05MB7076 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > sysctl_sched_wakeup_granularity's default value hasn't been touched since= =0A= > 2009:=0A= > =0A= > 172e082a9111 ("sched: Re-tune the scheduler latency defaults to decrease = worst-case latencies")=0A= >=0A= > and the automagic scaling (see kernel/sched/fair.c::update_sysctl()) hasn= 't=0A= > changed much either.=0A= > =0A= > What's likely to happen here is that you have a service in your distro (o= r=0A= > somesuch) tweaking those values and since the incriminated commit moves= =0A= > those files to /sys/kernel/debug/sched/, said service doesn't do anything= =0A= > anymore.=0A= =0A= Hi Valentin,=0A= =0A= In our testing, we use RHEL 8.1 distro. It looks like tuned daemon updates= =0A= 15ms (per tuned virtual-guest profile) in /proc/sys/kernel/sched_wakeup_gra= nularity_ns=0A= file during tuned's startup.=0A= =0A= Now tuned daemon is not able to update the value as the commit moves those= =0A= files to debugs and thus sched_wakeup_granularity_ns file remains with the= =0A= default value.=0A= =0A= Regards,=0A= Rahul Gopakumar,=0A= Performance Engineering,=0A= VMware, Inc.=