On Sun, 6 May 2012, Pasi Kärkkäinen wrote:
with "fork performance" I assume you're comparing Xen PV to KVM ?
Yes, PV has disadvantage (per design) for that workload, since the hypervisor
needs to check and verify each new process page table, and that has some
performance hit.
For good "fork performance" you can use Xen HVM VMs, which will perform well
for that workload,
and won't have the mentioned performance hit.
I used both PV and HVM VMs. I don't have the details to hand at the
moment, but KVM was superior to both. PV drivers where applicable. I have
been running KVM for about 15 months now, with 30 VM's on one host and 38
VM's on another. It has been solid; no problems, but unfortunately I had
problems with Xen.
Steve
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