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From: | David Barrett |
Subject: | [Qemu-devel] AMD 100% CPU bug; patch available? |
Date: | Tue, 12 Aug 2008 09:36:08 -0700 |
User-agent: | Thunderbird 2.0.0.16 (X11/20080724) |
Or is there a known bug that qemu with a Ubuntu guest always uses 100% CPU on AMD Ubuntu hosts? If so, is there a patch or workaround for it?
I don't know this for certain, but it's the only pattern I can see: I've run qemu on a bunch of laptops and servers over the past 12 months -- often with the exact same image and exact same commands -- and some hosts see the guest VM use limited CPU, and others a solid 100%. This seems to be the case whether or not -kernel-kqemu is used.
At first I thought it was an Ubuntu/Fedora Core issue, as I was running Ubuntu on laptops and FC4 on servers (and I only saw this problem on servers). But I just got a new Ubuntu server and the problem remains.
Now I realize there's another commonality: my servers have been AMD-based, whereas laptops were Intel based. With this theory I looked through the user forum and saw a strong correlation between reports of 100% CPU and AMD processors.
Is this old news or a debunked theory?Is there some tool like CPUIdle I should be running? Any suggestions for how to start debugging the issue?
Thanks! -david
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