Re: Re: Scheduling groups, credit scheduler support

[Samuel Thibault <samuel.thibault@eu.citrix.com>]

Mike D. Day, le Fri 14 Dec 2007 08:35:36 -0500, a écrit :
> On 04/12/07 23:06 +0000, Keir Fraser wrote:
> > On 4/12/07 13:50, "Mike D. Day" <ncmike@us.ibm.com> wrote:
> > 
> > >> It's good to see these patches get aired again. I hope we can get some
> > >> integration with the ongoing stub domain work and get some numbers out to
> > >> prove better scalability and QoS. This would ease the passage of scheduler
> > >> group support into xen-unstable.
> > > 
> > > I previously published some benchmarks:
> > > 
> > > http://article.gmane.org/gmane.comp.emulators.xen.devel/39818/
> > 
> > Not slowing down microbenchmarks is the least we should expect for
> > acceptance. The feature needs to earn its keep in the tree by demonstrating
> > superior performance or scalability in a situation we care about. Like for
> > HVM stub domains. :-)
> 
> Yes of course. But it also must not slow normal scheduling, which is
> the point of these benchmarks. As soon as the stub domain is ready for
> testing I'll start performance work on hvm domains.

It is available on

http://xenbits.xensource.com/ext/xen-minios-stubdom.hg

I tested groups a bit (the merge goes very fine) but couldn't see a
difference, probably because my test case is very limited (just a
CPU burner in dom0), compared to the scheduling boost of the credit
scheduler.

Samuel