Re: [Xen-users] Network performance problem

[James Wilson <jwilson@xxxxxxxxxxxxxxxxx>]

I am having a similar issue I see the retransmissions and dup acks 
basically everything you are seeing. The 2 things that are different on 
my end is that I'm using centos5 and piranha(for a virtual failover IP). 
I see the duplicate and retranssmissions on eth1:1(the vip from 
piranha). Would the below fix for you also apply to me(ethtool -K eth0 
tx off). Also would I apply this to the VIP? ethtool -K eth1:1 tx off?
Fridtjof Busse wrote:
> * Ralf Kaestner <Ralf.Kaestner@xxxxxx>:
>   
> > Has the guest enabled any TCP task offloading (if yes try turning it
> > off)?
> >     
> You already gave me the right hint, without me noticing:
> 'ethtool -K eth0 tx off' in the domUs.
> That immediatly fixed the problem. Thanks!
> Question remains: Why does it fix the problem? I never had to do that
> with kernel 2.6.18 (Xen 3.1.0) from XenSource.
>
>   
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