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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:1.9.1.9) 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 panic.
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