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RE: [Xen-devel] dom0 starves guests off CPU

from [Rik van Riel]

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To:	James Harper <james.harper@xxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] dom0 starves guests off CPU
From:	Rik van Riel <riel@xxxxxxxxxx>
Date:	Mon, 20 Feb 2006 19:06:45 -0500 (EST)
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On Tue, 21 Feb 2006, James Harper wrote:

> I found this too when doing a compile in dom0. Search the archives for a
> thread titled 'Performance problems' from January this year.

Ohhhhh.

> At a guess, the default scheduling assumes that all of dom0's work is 
> going to be related to serving data (block and network) to domU's, so it 
> makes sense to give it priority.

That's not a safe assumption.  People will be running CPU
intensive things in dom0, if only things like apt-get, yum
or recompiling a new package after a security bug was found.

Also, some people will want to use dom0 as their desktop,
with a few guest domains as test machines...

I believe that the default should be safe, even if it's not
the most high performance setting for some configurations.

-- 
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