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

On Sat, 5 Mar 2005, Tupshin Harper wrote:

> > 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

I was referring to standard kernel profiling, booting the
domain with "profile=2" as an extra boot option, and looking
at the data in /proc/profile with the readprofile tool.

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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