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xen-devel
Re: [Xen-devel] 2.4.29-xenU VBD performance (problem)
Ian Pratt wrote:
But, under domU (2.4.29-xenU), using that same lvm-volume as
VBD, I only get around
10 - 12 MB/sec write performance measured in the same way.
That's very odd -- I see virtually no loss of throughput in a domU.
However, 100MB isn't really enough to get a decent measure as its likely to all
still be in memory -- sync doesn't do what you think. I usually do measurements
using a transfer size of 10x the memory of the system.
A couple of other things to try if you still experience poor peformance:
* use a 2.6 domU
* use a raw partition rather than LVM
We do most of our testing using 2.6 for everything, so its possible there a
weird 2.4 domU to 2.6 dom0 performance bug.
Right. And to some extent, comparing 2.4 to 2.6 is
a bit of an apples to oranges comparison. There are
other differences in the kernel path - not just the
virtual block driver coming out of domU.
thanks,
Nivedita
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