Re: [Xen-devel] Xen cpu usage limting

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

All network I/O on your system is done via PIO if you're still using
the 3c595 card. Any network-intensive workload will screw system-wide
performance. If you care about performance then you need GigE NICs, or
a 3c905.

 -- Keir

> Well, I'm not certain exactly to be honest. the filesystems are nfs
> mounted.  the domain that was eating everything up was stuck in a nasty
> php infinite loop.
> I'll see if I can do a bit more tracking and report back. It may very well
> have been a network saturation problem.( gotta locate a few more
> compatible cards. and get gig-e backside for the nfs mounts.)
> 
> I was also wondering if there is a way to assign a percentage of cpu time
> to a domain. Eg guarantee domain 3 gets 25% of the cpu time no matter how
> many other domains are in there, or how much cpu time they want.
> 
> Also, I assume that xc_dom_control list right most column shows the amount
> of time each domain has eaten up?
> 
> 
> -- 
> Brian Wolfe           | Phone 1-(214)-764-1204
> President,            | Email  brianw@xxxxxxxxxxxx
> TerraBox.com Inc.     |
> 
> 
> pub  1024D/73C5A2DF 2003-03-18 Brian Wolfe <brianw@xxxxxxxxxxxx>
>      Key fingerprint = 050E 5E3C CF65 4C1E A183  F48F E3E3 5B22 73C5 A2DF
> sub  1024g/BB87A3DD 2003-03-18
> 
> 
> Rolf Neugebauer said:
> > Hi Brian,
> >
> > which version of Xen/Xenolinux are you using? the scheduler
> > implementation changed from 1.2 to 1.3-unstable.
> >
> > On Fri, 2004-04-16 at 17:40, Brian Wolfe wrote:
> >> Is it possible? How? (looked for documentation, but I didn't see any.)
> >> I did see xen_cpuperf, but I can't get any real information from there
> >> either. 8-(
> >>
> >> I have 8 domains (including domain-0) runing on the server. If one goes
> >> to
> >> 100% cpu time, the system bogs. I'd like to be able to ensure that each
> >> instance can't keep the rest from runing...
> >
> > This should definitely not happen!!! Could you provide a little more
> > detail on what is running in the different domains?
> >
> > In 1.2 the scheduler is a weighted proportional share scheduler (BVT)
> > and by default all domains get the same weight and therefore should get
> > the same share.
> >
> > in 1.3 you have a boot-time choice between schedulers, BVT (same as in
> > 1.2, Atropos (a soft real time scheduler based on EDF)
> >
> > I have just tested with 1.3-unstable, four domains on a dual processor
> > machine (two domains per CPU) and BVT as the scheduler and they happily
> > share the CPU 50/50 if both run the equivalent of a while(1) loop.
> >
> > Rolf
> >
> >
> >
> >
> >
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> 
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