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