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Date:      Thu, 05 Oct 2006 12:13:58 -0700
From:      Paul Lathrop <plathrop@squaretrade.com>
To:        Chuck Swiger <cswiger@mac.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: PAE tuning
Message-ID:  <45255976.10903@squaretrade.com>
In-Reply-To: <CC3AFB13-8FD9-44AB-A4FB-01F898B491C0@mac.com>
References:  <45254F1D.5000106@squaretrade.com> <CC3AFB13-8FD9-44AB-A4FB-01F898B491C0@mac.com>

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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 writte=
n
>> down WHICH tunables need to be adjusted besides the one mentioned abov=
e,
>> nor is there any information on what "reasonable value" means!
>>
>> Can anyone point me at a resource for more information on this?
>=20
> 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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