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Wed, 23 Sep 2020 07:09:09 +0000 From: Abdul Anshad Azeez To: Thomas Gleixner , "linux-kernel@vger.kernel.org" , "x86@kernel.org" , "netdev@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" CC: "rostedt@goodmis.org" Subject: Re: Performance regressions in networking & storage benchmarks in Linux kernel 5.8 Thread-Topic: Performance regressions in networking & storage benchmarks in Linux kernel 5.8 Thread-Index: AQHWkLxv33yBR7j1VE2lVgq0lG/dkKl0hMqAgAFKF7s= Date: Wed, 23 Sep 2020 07:09:09 +0000 Message-ID: References: ,<87h7rqaw8u.fsf@nanos.tec.linutronix.de> In-Reply-To: <87h7rqaw8u.fsf@nanos.tec.linutronix.de> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: linutronix.de; dkim=none (message not signed) header.d=none;linutronix.de; dmarc=none action=none header.from=vmware.com; x-originating-ip: [183.82.217.194] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a74d1df8-5e77-4d5d-f459-08d85f8f910c x-ms-traffictypediagnostic: BYAPR05MB5653: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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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: BYAPR05MB4839.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a74d1df8-5e77-4d5d-f459-08d85f8f910c X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Sep 2020 07:09:09.0143 (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: Me7KX6whOV1j1/o2/aBTVhL/5+lygkL4oWYa2nH3TV8gue3NEj+Lt9r5pPh8S83538jHbTZJ1/Y9XkrmI8j8/g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB5653 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello Thomas,=0A= =0A= Thank you very much for your comments.=0A= =0A= Since the performance regressions were fixed when we tested version 5.9-rc4= , we =0A= were not reporting it as an issue and our intention was just to share this = as an=0A= information only.=0A= =0A= Thanks,=0A= Abdul Anshad A=0A= =0A= =0A= From: Thomas Gleixner =0A= Sent: Tuesday, September 22, 2020 04:55 PM=0A= To: Abdul Anshad Azeez ; linux-kernel@vger.kernel.org ; x86@kernel.org ; netdev@vger.= kernel.org ; linux-fsdevel@vger.kernel.org =0A= Cc: rostedt@goodmis.org =0A= Subject: Re: Performance regressions in networking & storage benchmarks in = Linux kernel 5.8 =0A= =A0=0A= Abdul,=0A= =0A= On Tue, Sep 22 2020 at 08:51, Abdul Anshad Azeez wrote:=0A= > Part of VMware's performance regression testing for Linux Kernel upstream= rele=0A= > ases we compared Linux kernel 5.8 against 5.7. Our evaluation revealed pe= rform=0A= > ance regressions mostly in networking latency/response-time benchmarks up= to 6=0A= > 0%. Storage throughput & latency benchmarks were also up by 8%.=0A= > In order to find the fix commit, we bisected again between 5.8 and 5.9-rc= 4 and=0A= >=A0 identified that regressions were fixed from a commit made by the same = author =0A= > Thomas Gleixner, which unbreaks the interrupt affinity settings - "e027ff= fff79=0A= > 9cdd70400c5485b1a54f482255985(x86/irq: Unbreak interrupt affinity setting= )".=0A= >=0A= > We believe these findings would be useful to the Linux community and want= ed to=0A= >=A0 document the same.=0A= =0A= thanks for letting us know, but the issue is known already and the fix=0A= has been backported to the stable kernel version 5.8.6 as of Sept. 3rd.=0A= =0A= Please always check the latest stable version.=0A= =0A= Thanks,=0A= =0A= =A0=A0=A0=A0=A0=A0=A0 tglx=