From: Damon Hart <dhcom@sundial.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: PostgreSQL performance on various distribution stock kernels
Date: Mon, 26 Nov 2007 18:41:39 -0500
Message-ID: <1196120499.19996.44.camel@xw1.bbd> (raw)
In-Reply-To: <5104.1196118394@sss.pgh.pa.us>
References: <1196117408.19996.16.camel@xw1.bbd>
<5104.1196118394@sss.pgh.pa.us>
On Mon, 2007-11-26 at 18:06 -0500, Tom Lane wrote:
> Damon Hart <dhcom@sundial.com> writes:
> > 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?
>
> Considering how raw Fedora 8 is, I think what you've probably found is a
> performance bug that should be reported to the kernel hackers.
>
Not being a kernel hacker, any suggestions on how to provide more useful
feedback than just pgbench TPS comparison and hardware specs? What's the
best forum, presuming this does boil down to kernel issues.
> Just to confirm: this *is* the same filesystem in both cases, right?
>
> regards, tom lane
Yes, same filesystem simply booting different kernels.
Damon
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To: pgsql-performance@postgresql.org
Cc: dhcom@sundial.com, tgl@sss.pgh.pa.us
Subject: Re: PostgreSQL performance on various distribution stock kernels
In-Reply-To: <1196120499.19996.44.camel@xw1.bbd>
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