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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BN8PR11MB3795.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7032bd5b-50d8-4d0b-befa-08d84db9f26f X-MS-Exchange-CrossTenant-originalarrivaltime: 31 Aug 2020 14:27:09.6727 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: roWwcE89zk9saLrCeRhqDN5DYUItj5usKljNWE15pLpfLXGBFoNwUSPwK6x/KoCVnNWB4GGYCf2SaXLd2UxRlA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR11MB0034 X-OriginatorOrg: intel.com Subject: Re: [dpdk-dev] [PATCH v2 0/5] maximize vector rx burst for PMDs 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" > -----Original Message----- > From: Stephen Hemminger > Sent: Saturday, August 29, 2020 04:31 > To: Guo, Jia > Cc: Wang, Haiyue ; Morten Br=F8rup ; Yang, Qiming > ; Xing, Beilei ; Zhao1, Wei= ; Zhang, > Qi Z ; Wu, Jingjing ; Richar= dson, Bruce > ; dev@dpdk.org; Zhang, Helin ; Yigit, Ferruh > ; barbette@kth.se > Subject: Re: [dpdk-dev] [PATCH v2 0/5] maximize vector rx burst for PMDs >=20 > On Fri, 28 Aug 2020 14:39:33 +0800 > Jeff Guo wrote: >=20 > > >> I am not sure about this, but if I read it correctly, calling rte_et= h_rx_burst() with nb_pkts =3D > 33 > > >> (not 32) would only return 32 packets, even if more packets are avai= lable. (I assume that > > >> RTE_I40E_DESCS_PER_LOOP is 32.) In this case, I guess that you need = to read the remaining of the > > >> requested packets using the non-vector function in order to support = any nb_pkts value. > > >> > > > This is vector instruction handling design requirement, like for avx2= : #define > ICE_DESCS_PER_LOOP_AVX 8, > > > if deep into the real loop handling, you will get the point why doing= RTE_ALIGN_FLOOR. ;-) > > > > > > _ice_recv_raw_pkts_vec_avx2: > > > for (i =3D 0, received =3D 0; i < nb_pkts; i +=3D ICE_DESCS_PER_LOOP_= AVX, rxdp +=3D ICE_DESCS_PER_LOOP_AVX) > > > > > > Maybe it is worth to tell PMD to stop using vector by calling rte_eth= _rx_queue_setup with the > application > > > burst size it wants. >=20 > There is no need for yet another nerd knob in DPDK. >=20 > The driver must accept any burst size > 0. > If it wants to optimize for certain multiples, then it can do so in its b= urst handler. > Like any optimized checksum calculator does. I think if people care about performance, then PMDs have done every possibl= e methods like the burst size, then no need to invent their burst handers. ;-) At least, burst size is an optimize hit for performance.=20