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[Qemu-devel] Re: [PATCH 10/12] kvm: enable smp > 1

From: Avi Kivity
Subject: [Qemu-devel] Re: [PATCH 10/12] kvm: enable smp > 1
Date: Thu, 20 May 2010 09:12:56 +0300
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4

On 05/19/2010 11:02 PM, Udo Lembke wrote:
Unrelated, what are your smp issues?

If i use one cpu i got a good io-performance:
e.g. over 500MB/s at the profile "install" of the io-benchmark h2benchw.exe. ( aio=threads | SAS-Raid-0 | ftp://ftp.heise.de/pub/ct/ctsi/h2benchw.zip | hwbenchw.exe -p -w iotest 0)
The same test but with two cpus gives results between 27 and 298 MB/s!

Also in real life it's noticeable not only with an benchmark. I use a win-vm with two cpu for postscript-ripping and have a performance drop due to the bad io.

What's your block device model?  virtio or ide?

What does cpu usage look like on guest or host?

Do not meddle in the internals of kernels, for they are subtle and quick to 

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