From owner-freebsd-stable@FreeBSD.ORG Mon Jan 25 18:38:29 2010 Return-Path: Delivered-To: stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4BD751065679 for ; Mon, 25 Jan 2010 18:38:29 +0000 (UTC) (envelope-from ncrogers@gmail.com) Received: from mail-px0-f183.google.com (mail-px0-f183.google.com [209.85.216.183]) by mx1.freebsd.org (Postfix) with ESMTP id 1A0258FC24 for ; Mon, 25 Jan 2010 18:38:28 +0000 (UTC) Received: by pxi13 with SMTP id 13so2624750pxi.3 for ; Mon, 25 Jan 2010 10:38:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=xcm4b38HRp1VUnTaTxGxl+D1sh7zpfCtFq1IGluRoAg=; b=QSPEv6aRlkHE1zd9ewVIWbREBCwqODNRkglLK2+L+GCV2OssDTegeczrvk7z3ULUmW J3ji4JVWBTLIlAFikSGYIrU8rjcnrGe/u+2S3DnxPLkByI+FwQW4W/iRc6lzrZrWL7/n pmd9RTVqTSX50WQ79zh5IYo0YZQIzWFe4ucxY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=eAYIKPxcpXiloq5m5IGQkhbGHkn/oyUXEPUWXEc7yt9nIY6zKOsH4q1z5Mad++r3qF gRfiYDUWIMRVE5uFstoajc7R0PGHB+qdwXB9QJF+zoTrjwcl9YCv/T3LbIq7aGyfarEc 0AoJNGXV8qdxa7rFOgOObODx79Tv9mpJ0X0NY= MIME-Version: 1.0 Received: by 10.142.56.13 with SMTP id e13mr4752367wfa.119.1264444708551; Mon, 25 Jan 2010 10:38:28 -0800 (PST) In-Reply-To: <20100125182257.GG1187@michelle.cdnetworks.com> References: <20091201.102925.218343479.hrs@allbsd.org> <2a41acea0912021249w1aed8e83kf89ceb1e6041edaf@mail.gmail.com> <2a41acea0912021514r2d44dd33n4c364518d7fe1703@mail.gmail.com> <20091203.182931.129751456.hrs@allbsd.org> <4B43F6EE.3010308@ucla.edu> <147432021001242047k659a26d0s44b35164920aeb74@mail.gmail.com> <95D3CB82-BC44-491D-86E4-5CB82F89C0FC@nokia.com> <147432021001250825p202914a7ka5a2c1d28d96bac3@mail.gmail.com> <20100125182257.GG1187@michelle.cdnetworks.com> Date: Mon, 25 Jan 2010 10:38:28 -0800 Message-ID: <147432021001251038r69393ab3m1a797e58f9fa905a@mail.gmail.com> From: Nick Rogers To: pyunyh@gmail.com Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: Jason Chambers , "stable@freebsd.org" , "jfvogel@gmail.com" , Lars Eggert Subject: Re: em interface slow down on 8.0R X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Jan 2010 18:38:29 -0000 On Mon, Jan 25, 2010 at 10:22 AM, Pyun YongHyeon wrote: > On Mon, Jan 25, 2010 at 08:25:43AM -0800, Nick Rogers wrote: > > I have not tried toying with any tcp sysctl. I'm not having performance > > problems so much as the interface just stops working entirely, which I > would > > think has nothing to do with the TCP stack when layer 2 is not > functioning? > > > > I'm not sure you're seeing a checksum offload bug of em(4) but the > bug is easily reproducible in VLAN environments. If the issue is > gone when you disable TX checksum offloading, see kern/141843 for > for more detailed information as well as fix. > Good to know, but I am having a similar problem on another em(4) interface that has no VLAN interfaces. > > > I'll give it a shot if I can. For the moment I have had to switch to a > > different (lower performance) network card to get things stable and I > would > > like to be aware of a more concrete driver fix in STABLE before switching > > back my production machines. > > > > On Mon, Jan 25, 2010 at 6:25 AM, Lars Eggert > wrote: > > > > > Hi, > > > > > > have you tried turning off TCP Segmentation Offloading > (net.inet.tcp.tso > > > sysctl)? That fixed performance issues with some em cards for me. > > > > > > Lars > > > > > > >