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Re: [Xen-devel] slow xenU domains

To: David Becker <becker@xxxxxxxxxxx>
Subject: Re: [Xen-devel] slow xenU domains
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Sat, 09 Oct 2004 10:07:09 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx
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In-reply-to: Your message of "Fri, 08 Oct 2004 20:48:57 EDT." <20041009004857.GB7067@xxxxxxxxxxx>
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Are you logging in via ssh or the virtual console? If the latter there
may be an issue with xend collecting messages from the message ring
properly -- certainly I've seen problems when hitting the virtual
console with a lot of data.

 -- Keir

> 
> Over the two weeks or more I've been seeing occasional xenU run slowly as
> soon as they are created.   Once I get logged in, command line response
> is intermittent and bursty.   Activity will stall then proceed in a
> burst.   If the domain is shutdown and restarted, it often runs fine,
> but may again be slow.   There are no log messages from xen,
> xen0, or xenU.
> 
> I just upgraded to today's pull on 85 hosts, and about 10% of xenU
> domains showed this slow behavior.  I've not had any trouble with xen0.
> This is with both linux 2.4 and linux 2.6 as xen0 and xenU.
> Most of the machines are uni's, and a mix of PIII and P4 cpus.
> For now, I have to revert this batch of boxes to stock linux.
> 
> (XEN) Using scheduler: Borrowed Virtual Time (bvt)
> 
> 
> Is there a way to inquire what the current scheduler is and what its
> params are?  How do I see the priorities of the domains?
> 
> 
> 
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