WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] Strange lag with pv_ops dom0 kernel

To: Christophe Saout <christophe@xxxxxxxx>
Subject: Re: [Xen-devel] Strange lag with pv_ops dom0 kernel
From: Valtteri Kiviniemi <valtteri.kiviniemi@xxxxxxxxxxxx>
Date: Wed, 20 May 2009 05:06:41 +0300
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Tue, 19 May 2009 19:07:04 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <1242778985.4384.1.camel@xxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Organization: Dataproof
References: <C636A204.6867%keir.fraser@xxxxxxxxxxxxx> <d23ba09b0905181823qc2c0544y32451a4280d45a6@xxxxxxxxxxxxxx> <4A120CB2.3070900@xxxxxxxxxxxx> <1242778985.4384.1.camel@xxxxxxxxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Thunderbird 2.0.0.21 (Windows/20090302)
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



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>