increasing PMAP_SHPGPERPROC (was: FreeBSD 5.4 or 6.0 as postgresql-server)

Kris Kennaway kris at
Mon Nov 28 20:47:54 GMT 2005

On Mon, Nov 28, 2005 at 01:29:35PM -0500, Vivek Khera wrote:
> On Nov 28, 2005, at 1:09 PM, Claus Guttesen wrote:
> >kernel: collecting pv entries -- suggest increasing PMAP_SHPGPERPROC
> I've never been able to get good advice on how to tune this  
> parameter.  I believe on one box I just upped it by 50 from the  
> default (back in 4.x days) and stopped getting them.

In my experience it's usually best to make fractional changes like
this when tuning a parameter, since the defaults are usually nearly
good enough, and it's pretty hard to generate a workload that will
blow them out by a large amount.


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