Re: [libvirt-users] dramatic performance slowdown due to THP allocation failure with full pagecache
On Tue, Nov 14, 2017 at 11:03:30AM -0700, Blair Bethwaite wrote:
On 14 November 2017 at 10:56, Daniel P. Berrange
<berrange(a)redhat.com> wrote:
> Oh well THP usage inside the guest is then not really anything todo with
> virt, just a regular Linux questions, so not sure libvirt is the best
> place to ask.
True, I just hoped you or one of the other devs might have some
insight on reclaim behaviour that would provide a clue. I guess I'll
try a linux list.
Any comment on this (which is virt related):
(1) a related and possibly dumb question: in the case of a
high-performance KVM where the guest is hugepage backed and pinned in
host memory anyway, why do we still have a table based resolution for
guest physical to host virtual address translation - couldn't this
just be done by offset?
I don't know enough about KVM memory management to answer that. You probably
need to ask on the KVM mailing list to get the expert answer.
Regards,
Daniel
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