From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Hall Subject: Re: Broken RSS hash computation on Intel 82574L Date: Tue, 1 Sep 2015 07:47:26 -0700 Message-ID: <20150901144726.GA30421@mhcomputing.net> References: <55E44563.5050208@ics.muni.cz> <55E5B81E.8010601@ics.muni.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: dev@dpdk.org To: Martin =?utf-8?Q?Dra=C5=A1ar?= Return-path: Received: from mail.mhcomputing.net (master.mhcomputing.net [74.208.46.186]) by dpdk.org (Postfix) with ESMTP id 5A033568C for ; Tue, 1 Sep 2015 16:48:14 +0200 (CEST) Content-Disposition: inline In-Reply-To: <55E5B81E.8010601@ics.muni.cz> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On Tue, Sep 01, 2015 at 04:37:18PM +0200, Martin Dra=C5=A1ar wrote: > Dne 1.9.2015 v 15:45 De Lara Guarch, Pablo napsal(a): > > 82574L NIC uses em PMD, which does not support more than 1 queue. > > Therefore RSS is disabled in the NIC and then you cannot have RSS has= hes. > >=20 > > Thanks, > > Pablo >=20 > Hi Pablo, >=20 > that is an interesting information. I read the rationale in em_ethdev.c > and I was wondering, what would have to be done to enable RSS hash > computation on that card. I can live with just one RX queue, but hashes > would help me a lot. The computer which is using those NICs is not that > powerful and every bit of offloaded computation counts... >=20 > Thanks, > Martin RSS calculations are used to direct packets across multiple RX queues. Wi= th=20 only one RX queue it cannot possibly increase performance by enabling it. Matthew.