From mboxrd@z Thu Jan 1 00:00:00 1970 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) Received: by mail.mhcomputing.net (Postfix, from userid 1000) id D2B6D80BDAB; Tue, 1 Sep 2015 07:47:26 -0700 (PDT) Date: Tue, 1 Sep 2015 07:47:26 -0700 From: Matthew Hall To: Martin =?utf-8?Q?Dra=C5=A1ar?= 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-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <55E5B81E.8010601@ics.muni.cz> User-Agent: Mutt/1.5.23 (2014-03-12) Cc: dev@dpdk.org Subject: Re: [dpdk-dev] Broken RSS hash computation on Intel 82574L X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Sep 2015 14:48:14 -0000 On Tue, Sep 01, 2015 at 04:37:18PM +0200, Martin DraĊĦar 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 hashes. > > > > Thanks, > > Pablo > > Hi Pablo, > > 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... > > Thanks, > Martin RSS calculations are used to direct packets across multiple RX queues. With only one RX queue it cannot possibly increase performance by enabling it. Matthew.