From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f174.google.com (mail-ob0-f174.google.com [209.85.214.174]) by dpdk.org (Postfix) with ESMTP id C62345A38 for ; Tue, 1 Sep 2015 17:19:28 +0200 (CEST) Received: by obqa2 with SMTP id a2so1854354obq.3 for ; Tue, 01 Sep 2015 08:19:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=netgate.com; s=google; h=content-type:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=4OyzmlYPgvjTx2br2wFX9FaYj6pL5Jj8rOncDD3Aonk=; b=g17j49zhp7FPchYVjZNMKSsZ5Az5yxGwarN/0BFLRbODcCVOjCp+fKsz85aurE3jkk c3bQV86f9iS7jrv1i6+gvGQNyOIdFvSADZX3DvQNZVepObXu2J+3MfmXL6eDxtfz8xYv 2UbPI7vrd/ISmYaqYy4zGF6S86e5Ce7PoxZEI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:content-type:mime-version:subject:from :in-reply-to:date:cc:content-transfer-encoding:message-id:references :to; bh=4OyzmlYPgvjTx2br2wFX9FaYj6pL5Jj8rOncDD3Aonk=; b=h4kqXtpAAU0rPRmF8o9jHxDZhwn/32FDDAqqIzm1RK4VEAn+CA51AoH7tCGfA8lBGW AxuAHIi2OfBE6UOHketPcz93v1iUg8L06ydygRiEzXmey9s8vOhjlGMSoOTv3Whagh6M udtywR7RnYbJHZLlJC5e5bdRgQHU6RQPktcQBEmIpJ95+7FL10isNl8W47Vun5LSosyb pthJd+h8VGf1CHUdcRSXl6mVDTOJsS3swrDkX5ksBJjEnNYgmm7pwF3djqT4o1cOA/xZ ptaz6jeXPwJmYckDhYxdgV7oPANDQ76SAlIo8aa5Tj43gH5RwJMGnldeKq1vZMZcd1Y+ tr+A== X-Gm-Message-State: ALoCoQlBt0OPuAm2Bgz7+uBjI1rwfCLDPbT/2Ic8HyDjZoZsb5EfjtK9/4bs7kssjS5RNGPa7mSo X-Received: by 10.60.42.103 with SMTP id n7mr5761497oel.8.1441120767796; Tue, 01 Sep 2015 08:19:27 -0700 (PDT) Received: from ?IPv6:2610:160:11:33:a5a7:3134:6cb4:fb85? ([2610:160:11:33:a5a7:3134:6cb4:fb85]) by smtp.gmail.com with ESMTPSA id fw2sm12690057obb.24.2015.09.01.08.19.25 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 01 Sep 2015 08:19:25 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) From: Jim Thompson In-Reply-To: <20150901144726.GA30421@mhcomputing.net> Date: Tue, 1 Sep 2015 10:19:23 -0500 Content-Transfer-Encoding: quoted-printable Message-Id: <8B6A7DA3-93AF-4DD2-8857-2DB548A45B8D@netgate.com> References: <55E44563.5050208@ics.muni.cz> <55E5B81E.8010601@ics.muni.cz> <20150901144726.GA30421@mhcomputing.net> To: Matthew Hall X-Mailer: Apple Mail (2.2104) 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 15:19:29 -0000 > On Sep 1, 2015, at 9:47 AM, Matthew Hall = wrote: >=20 > 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 = hashes. >>>=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 >=20 > RSS calculations are used to direct packets across multiple RX queues. = With=20 > only one RX queue it cannot possibly increase performance by enabling = it. Well, there are other things you could use that hw-provided hash for=E2=80= =A6 (but point-taken)