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

[Christophe Saout <christophe@xxxxxxxx>]

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



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