PAE tuning

Paul Lathrop plathrop at
Thu Oct 5 12:14:10 PDT 2006

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!


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