[Bug 550409] Re: Slow disk IO for all guests with all disc modes and types.

[müzso]

I've tested this with Karmic+KVM+ext4 and the problem is present as
well. Using Karmic+KVM+ext3 resulted in the same performance boost as on
Lucid.

I'd be nice if others could comment on whether this problem is present
with Lucid/Karmic+Xen+ext4 too. I guess it should be, because the
problem seems to be between the default cache=writethrough policy and an
ext4 host OS filesystem. And changing either of them solves the issue.

Btw. I was using in Lucid qemu-kvm-0.12.3 and in Karmic qemu-kvm-0.11.0.
Probably this is not important in this bug.

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Slow disk IO for all guests with all disc modes and types.
https://bugs.launchpad.net/bugs/550409
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