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Tue, 3 Apr 2018 04:58:36 +0000 From: Shahaf Shuler To: Adrien Mazarguil , Yongseok Koh CC: =?iso-8859-1?Q?N=E9lio_Laranjeiro?= , "dev@dpdk.org" Thread-Topic: [dpdk-dev] [PATCH] net/mlx5: remove excessive data prefetch Thread-Index: AQHTuiRwcdqjwwAKuk2U6Ja5byErraPOHeiAgCB+j2A= Date: Tue, 3 Apr 2018 04:58:35 +0000 Message-ID: References: <20180312170545.16165-1-yskoh@mellanox.com> <20180313124459.GI3994@6wind.com> In-Reply-To: <20180313124459.GI3994@6wind.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [31.154.10.107] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; DB7PR05MB4267; 7:P9gUbSUMWOOMlfC0R68eSiuMaz/2VXYwVAgap5Fjnfrbv0URYEsNjZ1oPtpa8SFb81PnKrfJX9KVhCQWxiCTtYU4M42jcpgcSb5lEC3xQakGIHVPhhMmxLLOSN43oKZpmGuw7nxfpVIuC6cFlhk41//IM7beRXknBbmIl6XmReF0370nHPS5hxCs8kZdm93UEv05cv/Ni4WqM7yRmionqcaNVtavkvZVQX4Ynhq8gZ263PxEhVkRkuU1MU90Hewt x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-correlation-id: b5fb677d-b2d7-42d8-808c-08d5991f8ebb x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:; 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DIR:OUT; SFP:1101; SCL:1; SRVR:DB7PR05MB4267; H:DB7PR05MB4426.eurprd05.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: mellanox.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: T3f8pC4ROcvq/97e+zZegLD3NXXBUdPaU8ntz5fvrQ/ejiidytjVrqiky/b0hXHIv0jxmy1UVvZYQJblmOgVqNKuz2wlS2vqRaKMpDjqGGiFZp/trr4ehn0JzCuAQtWOAllYu6+WsmwhGkVpGdTN19dzqmKJ/fflVor/o3IvJ2HOpZUZLWdm6vGcrmmiocrg0yxuIerZpCUtI3Hdixxqd3LY2MX+1FOgWStAcPhHNqvjnwzRF6Kk86YJhg4ZhQbK/GO6KpvESoNWKMv3Bb5vhLcZ89FuvLafGQO/jwZUiPaIzL4YE6dFwh+w2/oSVcPhvpBkdmBVCNyKM8FYmaoz7pObJLhIx2wSUc/iP8Q/uaA1t4OcS8Oxj8Z126sHChKEIyc5a31ewH8rWLp9DKMdz4pBWtPX9JR/ehLuuhkXk0w= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: b5fb677d-b2d7-42d8-808c-08d5991f8ebb X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Apr 2018 04:58:35.9388 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB7PR05MB4267 Subject: Re: [dpdk-dev] [PATCH] net/mlx5: remove excessive data prefetch 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: , X-List-Received-Date: Tue, 03 Apr 2018 04:58:37 -0000 Tuesday, March 13, 2018 2:45 PM, Adrien Mazarguil: > Subject: Re: [dpdk-dev] [PATCH] net/mlx5: remove excessive data prefetch >=20 > On Mon, Mar 12, 2018 at 10:05:45AM -0700, Yongseok Koh wrote: > > In Enhanced Multi-Packet Send (eMPW), entire packet data is prefetched > > to LLC if it isn't inlined. Even though this helps reducing jitter > > when HW fetches data by DMA, this can thresh the LLC with evicting > precious data. > > And if the size of queue is large and there are many queues, this > > might not be effective. Also, if application runs on a remote node > > from the PCIe link, it may not be helpful and can even cause bad result= s. > > > > Signed-off-by: Yongseok Koh >=20 > Acked-by: Adrien Mazarguil Applied to next-net-mlx, thanks.=20 >=20 > -- > Adrien Mazarguil > 6WIND