Re: [Xen-users] poor network performance on domU

[Teun Vink <teun@xxxxxxxxxxxxx>]

On Mar 22, 2008, at 1:11 PM, Arvid Ephraim Picciani wrote:
> On Saturday 22 March 2008 13:07:35 Teun Vink wrote:
> > The network performance of the Dom0 is fine: I can saturate my 100Mb/
> > sec uplink both by uploading and downloading. Performance towards the
> > domU is fine as well. Performance from the DomU's to the internet
> > however is dramatic: speeds start at 2-3MB/sec but quickly drop to
> > just a few KB/sec (!). Transfer of large files never end at all.
> how is your domU to other domU speed?
> if it is even worse then the problems you describe are similar to  
> mine i had
> after updating to xen3.
> Then a helpfull soul on IRC gave me the hint to do
> "ethtool -K eth0 tx off"  in the domUs. that helped dramaticly.  
> looks like a
> bug in xen.
Speed between domU's was just as bad. I just applied your suggestion,  
and it's given an enormous increase in speed: between domU's I get  
around 20MB/sec, speed to the internet is limited by my uplink port now.
So thanks a lot for this hint!

Teun

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