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Thu, 16 Aug 2018 11:57:02 +0000 From: Shahaf Shuler To: Yongseok Koh CC: "dev@dpdk.org" , Raslan Darawsheh , Erez Ferber , Ali Alnubani , Wisam Monther , Olga Shern , "stable@dpdk.org" Thread-Topic: [PATCH v2] net/mlx5: disable ConnectX-4 Lx Multi Packet Send by default Thread-Index: AQHUNLsFzPzwtbqNLUSF4mDY0F0/UaTCRung Date: Thu, 16 Aug 2018 11:57:02 +0000 Message-ID: References: <20180813070018.101262-1-shahafs@mellanox.com> <20180815121730.87525-1-shahafs@mellanox.com> <21F5BB41-E163-4D6B-8DE3-4FE9EE67E822@mellanox.com> In-Reply-To: <21F5BB41-E163-4D6B-8DE3-4FE9EE67E822@mellanox.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=shahafs@mellanox.com; x-originating-ip: [31.154.10.105] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; DB7PR05MB5098; 6:2rSNWacJB71+HzpL2XNX92RRu59oIGv/lIgsK1hjmgzF+PYZ42Gt3hxUBan3VjPAMUqkRHtdEVSl2raMzVQnjElaS5hca2rIRqsZF4i5996ZN7W26VFBSXfp61wwKjKUmXavPIpjAiRJk9Gl9qtKRksVXXculOhSvpeVl9oSvlQUnLac5TWDOCDcWMK4IZHW5kSiuEOyPcTk5Kr3RDKK5cn6FtRMCZgg3yU30jEIvJi+3idrdBdd+vSdEcL6VeFWirKQ3uhHpYsD/aQLwGFNCyMmPyX29GM3jWKEgAp848CEHL2H4LoDNKbMpL/VeqcFRy50Ve0AU/fOLqE+oTC93JVeFSeijUYnLt1r/PxYyMU5tpAjl0hl+yQoPGgtXSGqn6BLhKBcL1IeEoIlyvn6OT9RFNP8hqKc7kjcYK3Gki1Cq/RjAmtOU4FH9p8uoumTnpROoWNrMs6hMtJJdlomOA==; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: 51b18726-b41d-44ff-eb0f-08d6036f613e X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Aug 2018 11:57:02.6332 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB7PR05MB5098 Subject: Re: [dpdk-stable] [PATCH v2] net/mlx5: disable ConnectX-4 Lx Multi Packet Send by default X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Aug 2018 11:57:05 -0000 Wednesday, August 15, 2018 8:12 PM, Yongseok Koh: > Subject: Re: [PATCH v2] net/mlx5: disable ConnectX-4 Lx Multi Packet Send > by default >=20 >=20 > > On Aug 15, 2018, at 5:17 AM, Shahaf Shuler > wrote: > > > > On ConnectX-4 Lx the Multi Packet Send (MPW) feature is considered > > un-secure, as on some cases were the application provides incorrect > > mbufs on the Tx burst the host or NIC can get stuck. > > > > Hence, disabling the feature by default for this specific NIC. > > Users can still enable this feature and enjoy the performance gain > > (mostly for low number of cores) by using the txq_mpw_en devarg. > > > > This patch will impact the out of the box performance of some > > application using ConnectX-4 Lx for the sack of security and robustness= . > > > > Since we need different defaults based on the underlying device the > > mpw field in the configuration struct was extended to contain also the > > MLX5_ARG_UNSET option. > > > > Cc: stable@dpdk.org > > > > Signed-off-by: Shahaf Shuler > > --- >=20 > Acked-by: Yongseok Koh Applied to next-net-mlx, thanks.=20 >=20 > Thanks