From owner-freebsd-net@FreeBSD.ORG Sat Jan 31 04:30:05 2015 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 75A1E940; Sat, 31 Jan 2015 04:30:05 +0000 (UTC) Received: from mail-we0-x234.google.com (mail-we0-x234.google.com [IPv6:2a00:1450:400c:c03::234]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 09FAF893; Sat, 31 Jan 2015 04:30:05 +0000 (UTC) Received: by mail-we0-f180.google.com with SMTP id m14so30374174wev.11; Fri, 30 Jan 2015 20:30:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=OkfFmupbNiOYfyiLjw2XWdxfsA89O//BPKYcI/OFVwc=; b=nAII8QZrqgb9RzPVvTrmqzJ41ByNf0f7XbYJWkCd2npWZDX0dpiA+8DLzBPz949ota 2nHS7uwoPR1Zf7c6+5OJulYNg2woEEdIAs9wTX/Nxa29qrpySYNhcyq9IfMgxL+Zy2fv CRpFR5D7zIBlG6a30h84258Gx+e+N1UcWdl4wII8h8wmA2IVsnQP85LdNnkkVIXYdAjN /PLvQflsDAbQxGkZjjyLe3dhILtO0jvwLlpqF4LXT9sHtlrBWLMOTCxzCCaOkQfM6vwt pvh94Zl9/fK5+AmQxMemybdDdSDz43X5q7QIzc5aVESiMLdQKR0oOjVMqAVhunT60Mgv vsDA== MIME-Version: 1.0 X-Received: by 10.194.77.201 with SMTP id u9mr19138993wjw.41.1422678602604; Fri, 30 Jan 2015 20:30:02 -0800 (PST) Received: by 10.194.101.106 with HTTP; Fri, 30 Jan 2015 20:30:02 -0800 (PST) In-Reply-To: <20150131010014.GB19333@strugglingcoder.info> References: <54CBF396.3090903@ignoranthack.me> <20150131010014.GB19333@strugglingcoder.info> Date: Fri, 30 Jan 2015 20:30:02 -0800 Message-ID: Subject: Re: Intel 82574L (em) From: Jack Vogel To: hiren panchasara Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.18-1 Cc: FreeBSD Net X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 31 Jan 2015 04:30:05 -0000 Yup, I wrote that :) Sean, I will check around to see if anything may have changed in that regard. Jack On Fri, Jan 30, 2015 at 5:00 PM, hiren panchasara < hiren@strugglingcoder.info> wrote: > On Fri, Jan 30, 2015 at 01:11:50PM -0800, Sean Bruno wrote: > > > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA512 > > > > > http://www.intel.com/content/dam/doc/datasheet/82574l-gbe-controller-datasheet.pdf > > > > According to 7.1.11, this device does indeed have 2 queues for stuff and > > or things. So, basic RSS would be possible in something like an Atom > box. > > > > I note that the em(4) driver intentionally disables this on > > initialization. I'm up for some science on my new shiny, soon to be > > router box. Any reason not to default to 1 queue and allow loader.conf > > to raise it to 2? > > Intel folks know better but it seems this is hartwell. > > em_setup_msix() in very start says: > > /* > ** Setup MSI/X for Hartwell: tests have shown > ** use of two queues to be unstable, and to > ** provide no great gain anyway, so we simply > ** seperate the interrupts and use a single queue. > */ > > Things may have changed now. I guess you can try enabling it and find out > :-) > > cheers, > Hiren >