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[Xen-users] Ppara-virtualized guest domain has better disk I/O performan

from [Liang Yang]

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Subject:	[Xen-users] Ppara-virtualized guest domain has better disk I/O performance than domain0?
From:	"Liang Yang" <multisyncfe991@xxxxxxxxxxx>
Date:	Mon, 25 Sep 2006 11:39:37 -0700
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Hi,

I did some SAS physical drive performance testing using IOMeter. I used thelatest xen-unstable version with Linux kernel 2.6.16.13. The Linux I used isRed Hat Enterprise AS 4.4. I compared the performance data between Xen LinuxDomain0 and Xen Para-Virtualized Linux Guest DomainU. I used the same Linuxkernel and ramdisk module for both dom0 and domU. To my surprise, I foundLinux 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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