Benoit Guguin wrote:
Hello,
I'm currently testing the KVM part of the new RHEL5.4.
I'm using IoZone becnhmark to test IO performance.
For my test I have dedicate a LVM partition to the IoZone benchmark :
iozone -a -U /mnt/bench/ -f /mnt/bench/test-file -R -b <file.xls>
I use the LVM partition in evry test (inside the VM or outside the VM).
Something is strange : IO Disk performance are better in a VM ...
Cache?
I have test a KVM VM with the option cache=none for the disk (system and
bench), but the performance are still better ...
Well I suppose something (KVM, special optimisation ?) do a cache but I didn't
find anything to control the behaviour ....
Any idea plz ?
Thank you in advance.
Regards,
--
Cheers
John
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