[Xen-devel] 2.4.29-xenU VBD performance (problem)

[Pasi Kärkkäinen <pasik@xxxxxx>]

Hi!

In dom0 (2.6.10-xen0), I'm able to write to lvm-volume at 35 - 40 MB/sec
(megabytes per second). Measured with:
"sync; date; dd if=/dev/zero of=/dev/vg0/lv0 bs=1024k count=100; sync; date"

But, under domU (2.4.29-xenU), using that same lvm-volume as VBD, I only get 
around 
10 - 12 MB/sec write performance measured in the same way.

What could cause this? This is a test-box, and I was only running one xenU
domain, and both the dom0 and domU were idle (besides that dd performance
measurement).

Thanks!

-- Pasi Kärkkäinen
       
                                   ^
                                .     .
                                 Linux
                              /    -    \
                             Choice.of.the
                           .Next.Generation.


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