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Date:      Thu, 5 Oct 2006 14:34:17 -0500 (PET)
From:      Richard Cotrina <>
To:        Paul Lathrop <>
Subject:   Re: PAE tuning
Message-ID:  <>
In-Reply-To: <>
References:  <> <> <>

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Have you thought in using 6.1/amd64 instead of 6.1/i386 + PAE ? Your Xeon
processor is supported under the amd64 port, using EM64T for addressing
more than 4GB.

I had some stability troubles in the past running mysql server with PAE
enabled, for a 6GB RAM server.


On Thu, 5 Oct 2006, Paul Lathrop wrote:

> Chuck Swiger wrote:
> > On Oct 5, 2006, at 11:29 AM, Paul Lathrop wrote:
> >> That's really good to know. Unfortunately, nobody seems to have written
> >> down WHICH tunables need to be adjusted besides the one mentioned above,
> >> nor is there any information on what "reasonable value" means!
> >>
> >> Can anyone point me at a resource for more information on this?
> >
> > You're supposed to tune the appropriate values considering the workload
> > the machine is going to handle.  "man tuning" has some additional
> > information, but without describing what kind of tasks you plan to do
> > with this machine with 14GB of RAM, nobody is going to be able to
> > provide you with really specific advice...
> Good point. :-)
> I intend to deploy this system as a database server running Postgresql
> 8.1. The database is huge (30-40Gb) and can easily grow (it has gone as
> high as 100Gb). I expect as many as 1000 concurrent database connections
> now, and a potential need for scaling this up later.
> I'm aware of the SystemV memory tuning issues related to running
> Postgres on FreeBSD and I'll address those as soon as I can get the
> system to see the RAM.
> I tried just installing the stock PAE kernel, but the system still
> doesn't even acknowledge the RAM above 4Gb. Is this because I have not
> yet performed the tuning?
> Thanks for your help!
> --Paul

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