From mboxrd@z Thu Jan 1 00:00:00 1970 From: Valtteri Kiviniemi Subject: Re: Strange lag with pv_ops dom0 kernel Date: Wed, 20 May 2009 05:06:41 +0300 Message-ID: <4A1365B1.2090101@dataproof.fi> References: <4A120CB2.3070900@dataproof.fi> <1242778985.4384.1.camel@leto.intern.saout.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1242778985.4384.1.camel@leto.intern.saout.de> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Christophe Saout Cc: "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org Hi, I dont think that's the case because the nic is autonegotiation the link and in dmesg I can see right after boot: eth0: Link is Up 100 Mbps Full Duplex, Flow Control: None eth0: 10/100 speed: disabling TSO - Valtteri Kiviniemi Christophe Saout kirjoitti: > Hi Valtteri, > >> I'm testing the 2.6.30-rc3-tip pv_ops kernel with Xen 3.4 (also tried >> 2.6.30-rc5-tip) and everything is working fine except domU performance. >> >> domU's boot up quickly but theres some strange lag. For example just >> typing "ps aux" or "dmesg" takes 5-10 seconds to finish. Load averages >> are 0 and cpu-usage reported by xentop is minimal. Theres also no >> indication of io-wait. > > This sounds like the known issue with Dom0 bouncing TSO packets. It > should go away once you disable TSO in your DomU's: > > /usr/sbin/ethtool -K eth0 tso off > > > Christophe > >