Re: [Xen-users] Xen hard-disk performance regression?

["Olivier B." <xen.list@xxxxxxxxx>]

On 12/04/2010 01:29, Fabiano Francesconi wrote:

I've tried with a (almost) vanilla kernel (only gentoo patchsets).

I have the same issue so, I guess, it's a kernel misconfiguration /
kernel regression but it must be something wrong upstream too.

Since I've been sharing with you my whole anamnesi, any of you has any
clue?
  

Can you try some more synthetics tests, with "dd" ?
latency on writes : dd oflag=dsync if=/dev/zero of=TESTFILE bs=4k count=10000
write speed : dd conv=fdatasync if=/dev/zero of=TESTFILE bs=4k count=128000
read speed : dd if=/dev/sda of=/dev/null bs=4k count=128000 (this one will be greatly affected by cache)

And can you try with differents FS, ext3 and ext4 for example ?

Olivier

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