[Xen-users] Ppara-virtualized guest domain has better disk I/O performance than domain0?

["Liang Yang" <multisyncfe991@xxxxxxxxxxx>]

Hi,

I did some SAS physical drive performance testing using IOMeter. I used the 
latest xen-unstable version with Linux kernel 2.6.16.13. The Linux I used is 
Red Hat Enterprise AS 4.4. I compared the performance data between Xen Linux 
Domain0 and Xen Para-Virtualized Linux Guest DomainU. I used the same Linux 
kernel and ramdisk module for both dom0 and domU. To my surprise, I found 
Linux domainU has better physical drive performance than Xen Linux domain0 
(for both small packet size and large packet size).
Can anyone explain this?

Thanks,

Liang


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