Comment 3 for bug 588293

Same problem here. Also the servers which write much a more affected.

As far as I see this commit should fix it.
http://git.kernel.org/?p=virt/kvm/qemu-kvm.git;a=commit;h=7eb58a6c556c3880e6712cbf6d24d681261c5095

Ubuntu Server Team, can you please test and backport this?