[CentOS-virt] performance differences between kvm/xen

Grant McWilliams grantmasterflash at gmail.com
Wed Oct 20 19:01:29 EDT 2010

On Wed, Oct 20, 2010 at 6:24 AM, Tom Bishop <bishoptf at gmail.com> wrote:

> Ok so I'd like to help, since most folks have Intel Chipsets, I have a AMD
> 4p(16 core)/32gig memory opteron server that I'm running that we can get
> some numbers on....but it would be nice if we could run apples to apples...I
> have iozone loaded and can run that but would be nice to run using the same
> parameters....is there any way we could list the types of test we would like
> to run and the actual command with options listed and then we would have
> some thing to compare at least  level the playing field...KB, any thoughts,
> is this a good idea?
> On Wed, Oct 20, 2010 at 6:52 AM, Karanbir Singh <mail-lists at karan.org>wrote:
>> On 10/20/2010 12:35 PM, Dennis Jacobfeuerborn wrote:
>> > Being skeptical is the best approach in the absence of
>> > verifiable/falsifiable data. Today or tomorrow I'll get my hands on a
>> new
>> > host system and although it is supposed to go into production
>> immediately I
>> > will probably find some time to do some rudimentary benchmarking in that
>> > regard to see if this is worth investigating further. Right now I'm
>> That sounds great. I've got a machine coming online in the next few days
>> as well and will do some testing on there. Its got 2 of these :
>> Intel(R) Xeon(R) CPU E5310
>> So not the newest/greatest, but should be fairly representative.
>> > planning to use fio for block device measurements but don't know any
>> decent
>> > (and uncomplicated) network i/o benchmarking tools. Any ideas what tools
>> I
>> > could use to quickly get some useful data on this from the machine?
>> iozone and openssl speed tests are always a good thing to run as a 'warm
>> up' to your app level testing. Since pgtest has been posted here
>> already, I'd say that is definitely one thing to include so it creates a
>> level of common-code-testing and comparison. mysql-bench is worth
>> hitting as well. I have a personal interest in web app delivery, so a
>> apache-bench hosted from an external machine hitting domU's / VM's ( but
>> more than 1 instance, and hitting more than 1 VM / domU at the same time
>> ) would be good to have as well.
>> And yes, publish lots of machine details and also details on the code /
>> platform / versions used. I will try to do the same ( but will  limit my
>> testing to whats already available in the distro )
>> thanks
>> - KB
>> ______

So what we're on the verge of doing here is creating a test set... I'd love
to see a shell script that ran a bunch of tests, gathered data about the
system and then created an archive that would then be uploaded to a website
which created graphs. Dreaming maybe but it would be consistent. So what
goes in our testset?

Just a generic list, add to or take away form it..

   - phoronix test suite ?
   - iozone
   - kernbench
   - dbench
   - bonnie++
   - iperf
   - nbench

The phoronix test suite has most tests in it in addition to many many
others. Maybe a subset of those tests with the aim of testing Virtualization
would be good?

Grant McWilliams
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