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Tue, 21 Jul 2020 04:11:39 +0000 Received: from AM0PR05MB4561.eurprd05.prod.outlook.com ([fe80::456:89d0:7f5c:c6c3]) by AM0PR05MB4561.eurprd05.prod.outlook.com ([fe80::456:89d0:7f5c:c6c3%4]) with mapi id 15.20.3195.024; Tue, 21 Jul 2020 04:11:39 +0000 From: Alexander Kozyrev To: Honnappa Nagarahalli , Phil Yang , Matan Azrad , Shahaf Shuler , Slava Ovsiienko CC: "drc@linux.vnet.ibm.com" , nd , "dev@dpdk.org" , nd Thread-Topic: [dpdk-dev] [PATCH v3] net/mlx5: relaxed ordering for multi-packet RQ buffer refcnt Thread-Index: AQHWWMITvRJ6cPOqEEiXXa7L02rE6qkRJjhAgAAsNgCAAA49EIAAFbsAgAAB6wA= Date: Tue, 21 Jul 2020 04:11:39 +0000 Message-ID: References: <20200410164127.54229-7-gavin.hu@arm.com> <1592900807-13289-1-git-send-email-phil.yang@arm.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US 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=mellanox.com; x-originating-ip: [2607:fea8:e380:d8e0:cc8e:6267:1dfa:5b55] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 550e0191-58ed-40f6-fe48-08d82d2c2b17 x-ms-traffictypediagnostic: AM0PR0502MB3890: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM0PR05MB4561.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 550e0191-58ed-40f6-fe48-08d82d2c2b17 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jul 2020 04:11:39.6759 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: QP0+vOqFj6xAqpIJfT7aUxKHcMBWHcYlhi1kj3l7LSRnzlnswUGuZSWzj5exvWDarqTWInCMJw7JaIRKi2t5YA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR0502MB3890 Subject: Re: [dpdk-dev] [PATCH v3] net/mlx5: relaxed ordering for multi-packet RQ buffer refcnt X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" >=20 > > > > Subject: RE: [dpdk-dev] [PATCH v3] net/mlx5: relaxed ordering for > > > > multi- packet RQ buffer refcnt > > > > > > > > Hi Phil Yang, we noticed that this patch gives us 10% of > > > > performance degradation on ARM. > > > > x86 seems to be unaffected though. Do you know what may be the > > > > reason of this behavior? > > > > > > Hi Alexander, > > > > > > Thanks for your feedback. > > > This patch removed some expensive memory barriers on aarch64, it > > > should get better performance. > > > I am not sure the root cause of this degradation now, I will start > > > the investigation. We can profiling this issue together. > > > Could you share your test case(including your testbed configuration) > > > with > > us? > > > > > > Thanks, > > > Phil > > > > I'm surprised too, Phil, but looks like it is actually making things > > worse. I used Connect-X 6DX on aarch64: > > Linux dragon71-bf 5.4.31-mlnx.15.ge938819 #1 SMP PREEMPT Thu Jul 2 > > 17:01:15 IDT 2020 aarch64 aarch64 aarch64 GNU/Linux Traffic generator > > sends 60 bytes packets and DUT executes the following command: > > arm64-bluefield-linuxapp-gcc/build/app/test-pmd/testpmd -n 4 -w > > 0000:03:00.1,mprq_en=3D1,rxqs_min_mprq=3D1 -w > > 0000:03:00.0,mprq_en=3D1,rxqs_min_mprq=3D1 -c 0xe -- --burst=3D64 -- > > mbcache=3D512 -i --nb-cores=3D1 --rxq=3D1 --txq=3D1 --txd=3D256 --rxd= =3D256 > > --auto- start --rss-udp Without a patch I'm getting 3.2mpps, and only > > 2.9mpps when the patch is applied. > You are running on A72 cores, is that correct? Correct, cat /proc/cpuinfo processor : 0 BogoMIPS : 312.50 Features : fp asimd evtstrm crc32 cpuid CPU implementer : 0x41 CPU architecture: 8 CPU variant : 0x0 CPU part : 0xd08 CPU revision : 3