Re: PostgreSQL performance on various distribution stock kernels

On Nov 26, 2007 5:00 PM, Alexander Staubo <alex@purefiction.net> wrote:
> On 11/26/07, Damon Hart <dhcom@sundial.com> wrote:
> > So, what's different between these tests? I'm seeing performance
> > differences of between +65% to +90% transactions per second of the
> > OpenVZ kernel running on the HN over the stock Fedora 8 kernel. Is
> > this reflective of different emphasis between RHEL and Fedora kernel
> > builds?  Some OpenVZ optimization on top of the RHEL5 build? Something
> > else? Where should I look?
>
> A recent FreeBSD benchmark (which also tested Linux performance) found
> major performance differences between recent versions of the kernel,
> possibly attributable to the new so-called completely fair scheduler:
>
>   http://archives.postgresql.org/pgsql-performance/2007-11/msg00132.php

Yeah, I wondered about that too, but thought the completely fair
scheduler was not on by default so didn't mention it.  Hmmm.  I
wonder.