On Wed, 15 Jun 2011 13:34:06 +0200
Alexander Graf <agraf@xxxxxxx> wrote:
>
> On 15.06.2011, at 12:50, Alexander Graf wrote:
> > What are your results when using the magic page? I have the following numbers with your patches applied:
> >
> > == bare metal ==
> >
> > root@e500:~/kvm# time for i in {1..1000}; do /bin/echo > /dev/null; done
> >
> > real 0m5.445s
> > user 0m0.204s
> > sys 0m0.572s
> >
> >
> > == no hypervisor node (magic page not used) ==
> >
> > debian-powerpc:~# time for i in {1..1000}; do /bin/echo > /dev/null; done
> >
> > real 1m36.362s
> > user 0m13.224s
> > sys 1m11.084s
> >
> >
> > == with hypervisor node (magic page used) ==
> >
> > debian-powerpc:~# time for i in {1..1000}; do /bin/echo > /dev/null; done
> >
> > real 2m28.888s
> > user 0m9.248s
> > sys 1m4.016s
>
> Interesting - now I'm down to:
>
> debian-powerpc:~# time for i in {1..1000}; do /bin/echo > /dev/null; done
>
> real 1m25.008s
> user 0m9.224s
> sys 1m5.720s
>
>
> Oh well, let's hope I did something wrong before :).
Remember, I have more paravirt patches coming after this (wanted to get the
MMU stuff dealt with first), and the kernel is still using 4K TLB1 pages in
the default qemu config. We should probably use TLB0 when large pages
aren't available.
Without paravirt, no large pages:
sh-2.05b# time for i in $(seq 1000); do /bin/echo > /dev/null ; done
real 0m42.769s
user 0m3.256s
sys 0m34.988s
With paravirt including my local patches (but still no large pages):
sh-2.05b# time for i in $(seq 1000); do /bin/echo > /dev/null ; done
real 0m40.339s
user 0m1.560s
sys 0m32.652s
With large pages and no paravirt:
sh-2.05b# time for i in $(seq 1000); do /bin/echo > /dev/null ;done
real 0m7.986s
user 0m2.528s
sys 0m3.232s
With large pages and paravirt, but just this patchset (no further paravirt
patches):
sh-2.05b# time for i in $(seq 1000); do /bin/echo > /dev/null ; done
real 0m6.067s
user 0m3.068s
sys 0m2.332s
With large pages and all my paravirt patches:
sh-2.05b# time for i in $(seq 1000); do /bin/echo > /dev/null ;done
real 0m3.837s
user 0m0.604s
sys 0m0.316s
On the host (different rfs, but I think similar in relevant ways, except
that the host rfs has SPE and guest rfs is soft-float):
# time for i in $(seq 1000); do /bin/echo > /dev/null ; done
real 0m1.850s
user 0m0.028s
sys 0m0.236s
I used seq because my rfs is using an older bash that doesn't seem to
understand the range expression.
-Scott
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