Re: [Xen-devel] Xen cpu usage limting

["Brian Wolfe" <brianw@xxxxxxxxxxxx>]

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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