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Re: [Xen-devel] Xen cpu usage limting

To: "Brian Wolfe" <brianw@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Xen cpu usage limting
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Fri, 16 Apr 2004 17:47:47 +0100
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> 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...

I'm not sure exactly what you mean. By default each domain will get a
fair share of the CPU on which it runs -- if N domains are all
CPU-bound then each will get 1/N of the CPU. Domains which are woken
by an incoming event (eg. network packet or key press) should get run
with reasonably low latency.

By bogged down, do you mean that interactive response suffers? What is
the busy domain doing -- just CPU-intensive work and no I/O?

 -- Keir

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