Anthony Liguori wrote:
Hi,
This is an update to the paravirt_ops KVM backend series. I've made a
number of changes and attempted to incorporate all the feedback from
the last review. Some highlights:
1) Clean up the paravirt time source patch to use a more Xen-like model
2) Change the hypercall queueing to pass a PA on the flush hypercall
3) Add MMU support for release_{pt,pd} and TLB flush
4) Use KVM specific errno values
5) Switch from per_cpu to more appropriate functions
As for performance, I've got a few interesting results. kbuild with a
guest using 2G of memory goes from 19 minutes to 12 minutes with the
full series applied. Using 512mb, the build time goes from 10.75
minutes to 9 minutes. For 512mb, native is around 7 minutes so that's
pretty close to what Avi had seen. The more dramatic improvement with
large memory guests is probably because of the increased shadow page
table activity due to high mem.
Ah, that explains why we were getting such different results. My tests
were on x86-64.
virtbench shows major improvements but I'm not 100% confident yet in
the results as they are not very stable. I don't yet have a benchmark
that shows the benefit of the CR caching so if I don't find one, I'll
drop that from the queue.
The only barrier to merging is that we're introducing yet another stable
ABI. Since we can turn off things that turn out not so good later, and
expect the guest to survive, I'm not to worried, so I'm inclined to
merge this.
--
error compiling committee.c: too many arguments to function
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