I would be really interested in getting comparisons
between vanilla kernels and linux-vserver patched
versions, especially vs2.1.1 and vs2.0.2 on the
same test setup with a minimum difference in config
I doubt that you can really compare across the
existing virtualization technologies, as it really
depends on the setup and hardware
and kernel .config's :)
for example, I'm pretty sure, OVZ smp kernel is not the same as any of
prebuilt vserver kernels.
In my experience it is extremely hard to do 'proper'
comparisons, because the slightest change of the
environment can cause big differences ...
here as example, a kernel build (-j99) on 2.6.16
on a test host, with and without a chroot:
without:
451.03user 26.27system 2:00.38elapsed 396%CPU
449.39user 26.21system 1:59.95elapsed 396%CPU
447.40user 25.86system 1:59.79elapsed 395%CPU
now with:
490.77user 24.45system 2:13.35elapsed 386%CPU
489.69user 24.50system 2:12.60elapsed 387%CPU
490.41user 24.99system 2:12.22elapsed 389%CPU
now is chroot() that imperformant? no, but the change
in /tmp being on a partition vs. tmpfs makes quite
some difference here
filesystem performance also very much depends on disk layout.
If you use different partitions of the same disk for Xen, vserver and OVZ,
one of them will be quickest while others can be significantly slower
and slower :/
Thanks,
Kirill
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