Re: [Xen-devel] Re: Xen spinlock questions

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Jan Beulich wrote:
> > > > Jeremy Fitzhardinge <jeremy@xxxxxxxx> 06.08.08 22:21 >>>
> > > >         
> > Jan Beulich wrote:
> >     
> > > > In my tests, I only see it fall into the slow path a couple of thousand 
> > > > times per cpu for a kernbench run.
> > > >     
> > > >         
> > > Hmm, that's different then for me. Actually, I see a significant spike at
> > > modpost stage 2, when all the .ko-s get linked. The (spinlock) interrupt
> > > rate gets up to between 1,000 and 2,000 per CPU and second.
> > >   
> > >       
> > BTW, how much contention for CPUs was there?
> >     
> In Xen or the kernel? So far these are all Dom0-only measurements, so
> in Xen there should be no contention.
>   
OK.  The spinlock results are most interesting when there's contention 
for physical cpus between domains.
> To answer your other mail's question: It's defconfig builds I'm using.
>   
[SuSE defconfigs]  Presumably that has a lot enabled as modules.

   J

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