From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felix Leimbach Subject: Re: KVM-74 and network timeout? Date: Thu, 18 Sep 2008 11:13:26 +0200 Message-ID: <48D21BB6.4050308@gmx.net> References: <1890.192.168.75.50.1221707418.squirrel@192.168.75.51> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE To: kvm@vger.kernel.org Return-path: Received: from mail.gmx.net ([213.165.64.20]:51849 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752333AbYIRJOF (ORCPT ); Thu, 18 Sep 2008 05:14:05 -0400 In-Reply-To: <1890.192.168.75.50.1221707418.squirrel@192.168.75.51> Sender: kvm-owner@vger.kernel.org List-ID: Sean Mahrt wrote: > I=92ve noticed the guest with a lot of Disk I/O > (commercial detection) after a while has a lot of NFS timeouts=85. V= irtio > or E1000 give me the same result. I noticed exactly the same problem after moving from kvm-64 on a 2.6.25.3 host to kvm-74 on a 2.6.26.3 host. Adding to your observations: - CIFS shares are affected as well: Under heavy traffic I get timeouts from the server, see [1] - ne2k_pci and rtl8139 guests seem to be affected as well > Now the real bad part, I=92m getting > pings in the order of ms, like 20-100ms on a bridged connection=85 an= d NFS > is going crazy... My pings also increased from < 0.1ms to 16ms when the physical interfac= e of the bridge was maxed out. Don't know, whether transferring from VM to VM would also trigger that. > I=92m using smp on the guests (and the host), and 2.6.25 on the gues= ts=85 My guests where UP and mostly Windows Server 2003 and one Gentoo 2.6.26= , so I think the culprit is elsewhere. > Where should I start looking? Is this a KVM-74 issue? Bump to KVM-7= 5? You might try kvm-64 which is rock-solid for me when paired with a 2.6.25 KVM kernel module. [1] Sep 6 17:42:58 kernsrc@obelix CIFS VFS: server not responding Sep 6 17:42:58 kernsrc@obelix CIFS VFS: No response to cmd 46 mid 30836 Sep 6 17:42:58 kernsrc@obelix CIFS VFS: Send error in read =3D -11 Sep 6 17:51:28 kernsrc@obelix CIFS VFS: server not responding Sep 6 17:51:28 kernsrc@obelix CIFS VFS: No response for cmd 50 mid 3085= 0