Xen users - Jun 2007 - Any best practices for best DomU I/O performance?

Hi,

finally we are about to move our old servers to a new and Xen based one.
Now that I have compared performance of the native versus Dom0/DomU
performance I am wondering whether there are any best practices for best
I/O throughput. I am passing LVM2 logical volumes as block devices to
the DomUs. The performance trade-off for reads is acceptable (about 15%
loss). The trade-offs for writes are okay in Dom0 but really bad in
DomUs -- a DomU reaches just about 20% of the native performance. Do you
have any hints?

Setup: Xen 3.1/Linux 2.6.18.8, 2x Intel Xeon Dual Core, 8 GByte memory

Thanks,

Stephan


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