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[Xen-users] hvm performance

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] hvm performance
From: Tony Hoyle <tmh@xxxxxxxxxxxx>
Date: Mon, 28 May 2007 22:42:23 +0100
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I've been running xen with linux guests for a while now and thought I'd try windows as I have a new server. All seemed to go fine except performance is *horrible* - I'm currently installing Win2003 SP2 and it's been running over 12 hours (thank god for vnc) - each individual file is taking between 3 and 4 seconds each.

Server is an intel E6600 with plenty of memory so should be pretty fast.

I had a look around and it is apparently the performance of qemu-dm that's critical. That's currently pinned at 1% CPU usage and using 332MB of memory (pushing dom0 into swap as I only gave it 256MB) - is this normal? CPU load apart from that is:

dom0 8.7%
linux domu 0.3%
windows domu 5.6%

Load average of dom0 is 1.03.. but I can't for the life of me see why as the cpu is nearly idle.

So the CPU has buckets of spare capacity and xen isn't using it. I expect I've configured something very wrong. Any ideas?


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