Re: [Xen-devel] horrible nfs server performance on domU

[Tupshin Harper <tupshin@xxxxxxxxxxx>]

Rik van Riel wrote:

> On Fri, 4 Mar 2005, Tupshin Harper wrote:
>
>  
>
> > the "fileserver" domU has 256Mb allocated with 512MB of swap. I'm gettin
> > horrendous nfs performance (samba not really tested yet), and the fileserver
> > domU frequently is pegged at 99+% system cpu all being use by pdflush. The
> > swap is active but is not being used.
> >    
> Time to try out whether profiling works in domU, so we can
> figure out exactly where cpu time is being spent.  I'm willing
> to help you debug this problem.
>
>  
Great. Let me know of anything I can try. I'm happy to build custom 
kernels, try experimental patches, etc. I've never done any kernel 
profiling, but I'm happy to give it a shot. If you are referring to 
CONFIG_OPROFILE, then it seems that it's not selectable in a xen kernel atm
-Tupshin


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