Re: [Xen-users] poor I/O performance with PV drivers and I/O emu

[Tom Brown <xensource.com@xxxxxxxxxxxxxxxxxxx>]

On Wed, 15 Apr 2009, Riccardo Veraldi wrote:

<snip>

> Sequential output around 4MB/s, Sequential input about 50MB/s
a 12 to 1 ratio in read to write speed is probably NOT related to your 
drivers... drivers should have aproximately the same overhead on a read or 
a write. I would guess that there is something strange in your actual 
storage. I think you need to benchmark /dev/VolGroup00/test-1_disk from 
dom0 and figure out what your I/O system is capable of.
-Tom

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