Re: [Xen-users] Very slow domU network performance

[Matt Ayres <matta@xxxxxxxxxxxx>]

Winston Chang wrote:
> On Apr 4, 2006, at 1:59 PM, Stephen C. Tweedie wrote:
>
> > > The packet loss is as follows:
> > > domU --> domU  0% (using 127.0.0.1)
> > > domU --> domU  0% (using domU eth0 IP address)
> > > dom0 --> domU  ~100% (only 7 of 38464 made it!)
> > Yow.
> >
> > There have been a number of weird checksum problems identified in the
> > past with Xen's networking; a checkin was just made a day or two ago
> > which cleans up the checksum handling in a way which may well help here.
> > We'll have to see whether an updated dom0/domU kernel improves things
> > much.
> I ran the test with the latest xen-unstable build.  The results are the 
> same.
> When I ran 'xm sched-sedf 0 0 0 0 1 1' to prevent  domU CPU starvation, 
> network performance was good.  The numbers in this case are the same as 
> in my other message where I detail the results using the week-old xen 
> build -- it could handle 90Mb/s with no datagram loss.  So it looks like 
> the checksum patches had no effect on this phenomenon; the only thing 
> that mattered was the scheduling.
What was the previous weight of domain 0?  What is the weight assigned 
to the domU's and do the domU's have bursting enabled?
Thank you,
Matt Ayres

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