WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

RE: [Xen-users] GPLPV network performance

> On Sun, Jan 18, 2009 at 6:57 PM, James Harper
> <james.harper@xxxxxxxxxxxxxxxx> wrote:
> >> is there something I
> >> forgot to tweak?
> >>
> >> Dom0: Intel Q9450 2.66 GHz, OpenSuse11.0 64bit, xen 3.2.1_16881
> >> DomU: Windows 2003 SP2, GPLPV 0.9.12-pre13, file based.
> >> Iperf: 547 Mbits/sec (domu -> dom0)
> >>
> >
> > Also need to know:
> > . have you disabled any of the offload features in the windows
network
> > driver? (if you don't know how to do that then your answer is no :)
> > . how many vcpu's does Windows have?
> > . Is your windows 2003 32 or 64 bit?
> >
> 
> 
> Last week I setup two Windows 2003 32bit (one of them is cloned from
> the other), GPLPV, 2 CPUs each, with ACPI=1 on domU config. iperf got
> around 500 Mbps.
> 
> Then out of curiosity, I changed one of them to have one CPU, ACPI=0,
> and changed Windows HAL to Standard PC. iperf now gives me a whopping
> 1.4 Gbps.
> 
> Both tests where done without messing with any network offload
> settings. Is it safe to assume that, for now, Standard PC HAL will
> give better network performance compared to ACPI HAL when used with
> GPLPV? 
> 

That is a good question, but I don't know the answer. I get great
performance (>2Gbits/second) on my system without much effort at all,
even with SMP. My system is AMD though... maybe there is some difference
there?

With 1 cpu and ACPI, what was your performance like? (eg was it SMP
slowing you down or ACPI?)

I would be grateful if you could do a bit more testing here as this is a
recurring problem...

> Is it also the same case for the disk driver?

Probably. I think the problem is system based rather than simply network
based.

James

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users