Re: [Xen-devel] unusual domU memory performance

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

The only thing I could imagine is that maybe Xen incorrectly schedules 
the idle domain at some points, and that stops happening if you run two 
domains against each other. That would be a pretty stupid scheduling 
bug though and I'm pretty sure it's not happening.
 -- Keir


On 14 Nov 2005, at 13:41, Bryan D. Payne wrote:

> > What CPUs are the domains running on? This is most likely an artefact 
> > of the machine architecture, and nothing to do with Xen.
> Interesting.  The system is running with a single AMD Athlon 64 3500+ 
> processor (note that both dom0 and domU are compiled as 32-bit 
> systems).  There is a total of 2GB of RAM in the system, I have 1500 
> allocated to dom0 and 256 to domU.
> I had been contemplating this being an artifact of the system, but 
> couldn't come up with any reasonable explanation in my mind.  It just 
> seems off that if one program is being a resource hog, the other 
> wouldn't speed up.  However, I couldn't help but wonder if this was 
> somehow stressing Xen in such a way as to cause some unusual behavior. 
>  Anyway, if it's not Xen, then I shall keep looking elsewhere :-)
> Thanks,
> -bryan

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