On 12/23/2009 11:43 AM, Matthieu Olivier wrote:
All,
I am performing a study about KVM.
(Shame on me, I did not check the version of kvm module. All I know is
that I was using the last Red Hat EL 5.4. Anyway).
I used a DELL server 2950, with:
- 1 processor Xeon L5240 (3 Ghz, 6 Mo cache)
- 8 GB of RAM
- 4 disks SAS 15k in RAID-1
I created a procedure consist to launch a benchmark on several
virtual machine at the same time. Each session consist in testing X VM,
where X comes from 1 to 8. With nbench, I collected all results and
extracted an average value of results for each VM. Then, I multiplied
these average values by the number of VM in test, getting one unique
and generic value per session of test.
I did nearly the same with unixbench.
On the host side, I launched the same tests, except that instead of
running them in separate VM, I just launched several threads at the
same time thanks to a script.
My main purpose is watching the overhead due to these different
hypervisors, according bechmark results. I am not really in trouble
with KVM itself, but results of my benchmarks:
-> http://img121.imageshack.us/img121/9279/nbench.png
-> http://img704.imageshack.us/img704/953/unixbench.png
Indeed, where I have all results growing from 1 VM tested to 8 VM, we
can see the host growing from 1 to 8 VM. which seems good. But KVM
only increases from 1 to 4 VM, and then stays on the same order of
results, without growing anymore.
The situation is inverse on Unixbench, where KVM seems to
follow host's performances.
What does 'top' show for nbench with 8 guests? How about kvm_stat?
Are the results different for the 8 guests, or are they all making the
same progress?
--
error compiling committee.c: too many arguments to function
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
