Re: [Xen-users] Network nightmare. Is NAT better than bridge for DomU to DomU?

[Markus Hochholdinger <Markus@xxxxxxxxxxxxxxxxx>]

Hi,

Am Mittwoch, 25. Juni 2008 23:03 schrieb G. Michael Carter:
> Something to add... I just noticed when the traffic is going from DomU
> to Dom0/U the ST percentage on top goes to 50%.  Only happens for DomU
> to Dom0/U traffic.   What's ST?  Is it interrupt related?

perhaps you only have one cpu?

man vmstat
  [..]
  st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown.
  [..]

So your cpu cycles from your domU are stolen from dom0 to mange the virtual 
network!?


> G. Michael Carter wrote:
> > I'm having lots of fun with my xen machine...
> >
> > I've done all the tips I can find with sysctl and txqueuelen.
> > External machine to Xen Dom0 is about 40-50MB/s and to DomU's anywhere
> > between 10-40MB/s
> > But DomU to DomU is being a real pain.   Most times I only get 6MB/s.
> > One thing I've noticed (I think) is when my webserver domU talks to my
> > db domU speeds start fluctuating really bad and the network traffic is
> > rather small.  virt-top will report 60MB/s transmition on the vir
> > interfaces even though the file is only transferring at 2MB/s
> >
> > I was wondering if I set up a local virtual network would it be faster
> > than the bridge from DomU <-> DomU network?    Any one have any tips
> > other than what I've found about sysctl and txqueuelen?
> >
> > Michael
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users

-- 
greetings

eMHa

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