From: | "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com> |
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To: | "Alexander Staubo" <alex(at)purefiction(dot)net> |
Cc: | "Damon Hart" <dhcom(at)sundial(dot)com>, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: PostgreSQL performance on various distribution stock kernels |
Date: | 2007-11-26 23:06:39 |
Message-ID: | dcc563d10711261506h12b66f83n5f2c27e0d3a281bb@mail.gmail.com |
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Lists: | pgsql-performance |
On Nov 26, 2007 5:00 PM, Alexander Staubo <alex(at)purefiction(dot)net> wrote:
> On 11/26/07, Damon Hart <dhcom(at)sundial(dot)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.
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