From owner-freebsd-stable@FreeBSD.ORG Mon Jan 25 18:23:03 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 1BCA9106568F for ; Mon, 25 Jan 2010 18:23:03 +0000 (UTC) (envelope-from pyunyh@gmail.com) Received: from mail-qy0-f174.google.com (mail-qy0-f174.google.com [209.85.221.174]) by mx1.freebsd.org (Postfix) with ESMTP id BAB878FC13 for ; Mon, 25 Jan 2010 18:23:01 +0000 (UTC) Received: by qyk4 with SMTP id 4so357919qyk.7 for ; Mon, 25 Jan 2010 10:23:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:received:from:date:to:cc :subject:message-id:reply-to:references:mime-version:content-type :content-disposition:in-reply-to:user-agent; bh=13hu/jpJS3fIwDhI4QTwf2octCWooOFB4Mqrbv+bD2s=; b=v+LbhIbey6pXfW/CSme+1L1/3LrBHEWuP9Zvqyfq6gRoPrWb2dfpjrd+xReIzDFOlN EjQIeUnB1KFbLGO9dGM4LIXcAHpc7VgxiUKhXCYKVhlvXnyo3fcCGw27zjzhGoQnFmMB PL8WzAgxeVJWjFoVs/Sb6hr22I3aZz8l6MshA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:date:to:cc:subject:message-id:reply-to:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=Qzxb6lz/cvwkCovVUHLyCjZa9o4+vkk+5C4hsrt2YLAFgG89x2ELMjJ644pd6MEm+2 KiePK7Ev1xbZBrM6CMtoIPgZrWoVNX6Mw1j+mjIVXI3O1n/qtVdM/TcPm69tErotohqu 5CyrkS6BhltCwlSAL7uccboxCk8CG8pdvgrQk= Received: by 10.224.55.71 with SMTP id t7mr4321305qag.256.1264443780641; Mon, 25 Jan 2010 10:23:00 -0800 (PST) Received: from pyunyh@gmail.com ([174.35.1.224]) by mx.google.com with ESMTPS id 20sm3229823qyk.1.2010.01.25.10.22.57 (version=TLSv1/SSLv3 cipher=RC4-MD5); Mon, 25 Jan 2010 10:22:59 -0800 (PST) Received: by pyunyh@gmail.com (sSMTP sendmail emulation); Mon, 25 Jan 2010 10:22:57 -0800 From: Pyun YongHyeon Date: Mon, 25 Jan 2010 10:22:57 -0800 To: Nick Rogers Message-ID: <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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <147432021001250825p202914a7ka5a2c1d28d96bac3@mail.gmail.com> User-Agent: Mutt/1.4.2.3i 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 Reply-To: pyunyh@gmail.com 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 18:23:03 -0000 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. > 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 > > > >