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xen-devel
Re: [Xen-devel] poor I/O performance on domU
Anthony Liguori wrote:
I think that's a reasonable answer. It should be easy to test though.
Try your same test on dom0 and use /dev/loopN where N is the loopback
device that has your rootfs on it.
Only rootfs is exported from loopback device and I'm benchmarking access
to dom0's /dev/hda exported to domU as read-only.
As the rootfs image is quite small (16MB), I can't easily test access
speeds because it will fit into cache.
The difference between testing /dev/loopN access on dom0 and the virtual
block device on domU should tell you the Xen-imposed performance
penalty.
I did a quick test on my system and there was a 50% slowdown using the
loopback device doing your test so I imagine it's that.
Accessing exported loopback or some other device?
-jkt
--
cd /local/pub && more beer > /dev/mouth
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