Digimer wrote:
> On 10-11-09 11:49 AM, Dennis Jacobfeuerborn wrote:
>> AFAIK there are some issues with that benchmark not being free.
>> What I'm basically looking for is a simple comparison of a few key metrics
>> between common setups. For example a simple bonnie++ run on XenPV and
>> KVM+virtio_blk could already give people at least some baseline numbers.
>> Regards,
>>     Dennis
> I'd be happy to run some benchmarks. I've got some identical (if humble)
> machines... Would you want just a Xen vs. KVM? If so, what parameters or
> setup options would provide the best apples to apples comparison?
> The machines are;
> - quad core athlon II x4
> - 4gb ddr3
> - 1x 7200rom 500GB drive
> - Fedora 14, stripped (but identical) installs
> If these are too low end for useful results, let me know. Otherwise,
> I'll fire up Xen under Michael's 2.6.32-25-172 kernel with the stock
> 4.0.1 hypervisor on one machine, and can use the stock KVM/QEMU setup
> for another.
> Assuming all is fine, would it matter whether the VMs were F14 vs CentOS
> 5.5?
> I was thinking 3x runs each of;
> - bonnie++
> - Recompile Michael's kernel
> - ?? Please make suggestions
Thanks for the offer. The services which have in the past shown 
significant differences (my experience) are small, with lots of connects 
and io. Examples are NNTP (ak usenet news) and POP mail servers. I 
suspect that DHCP and DNS have too little io to show the effect, but I 
never had enough load to know. Unless web service has a lot of dynamic 
content, I doubt it would have enough load to show the difference unless 
someone has server image and load generator to use. I could probably dig 
up a simulated load for NNTP, but I don't have an easy way to preload a 
server. My days of generating test loads were when I ran ISP NNTP 
servers and only had to provide test loading against the servers.

Performance aside, There is still a lot of old or small hardware that 
just can't do KVM at all, and which are easier to administer with a VM 
which can be moved.

Bill Davidsen<david...@tmr.com>
   "We can't solve today's problems by using the same thinking we
    used in creating them." - Einstein

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