Anthony Liguori wrote:
I did, but using kbuild (a simple 'make' with defconfig), not
kernbench. I get (elapsed time) 308 sec for kvm and 243 sec for native.
kernbench is a little different. It does a find over the kernel
source tree to attempt to get as much of the kernel in the page cache
as possible. It also uses -j4 by default.
These numbers are pretty bad. I'd like to improve them, even without
PV.
I agree. Do you know what's missing at this point? There isn't a
whole lot of state saving going on for the light weight exit paths for
SVM.
The SVM code doesn't even have a lightweight vmexit path. For every
vmexit, it does the entire thing, including vmload/vmsave, fpu switch
(if needed), segment reloading, and msr reloading. It could use a lot
of work.
For kbuild vs. kernbench, I suspect that -j4 causes the shadow page
table cache to thrash. 1024 pages may be enough for a single instance
but not -j4. Hopefully replacing the eviction algorithm (currently
FIFO) will help. Otherwise we'll need to resize the cache again.
--
error compiling committee.c: too many arguments to function
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