How PMAP_SHPGPERPROC relate to vm.v_free_min, vm.v_free_reserved and vm.v_free_target?

[Bill Moran]

In response to "Eduardo Meyer" <dudu.meyer at gmail.com>:

> Heavy Apache usage is demanding a higher PMAP_SHPGPERPROC kernel
> option in my system. However I keep getting the NOTES-documented panic
> at boot time, meaning I need to adequately do vm.v_free_min,
> vm.v_free_reserved and vm.v_free_target sysctl tuning.
> 
> However, this sysctl vars dont have a description and I simply can't
> find any further documentation regarding how the vars relate among
> themselves and how they related to PMAP_SHPGPERPROC. Can anyone please
> explain some basics about how they relate and how I can do the tuning?
> 
> It is a 5.5-STABLE with 9GB of memory and PAE enable (sure).
> 
> Hackers' feedback or sysadmins' personal experiences are heavily appreciated.

How high did you raise PMAP_SHPGPERPROC?  We raised it to 250 on our
stock PostgreSQL systems and did not have to tweak any other values.

Note that we're running 6.x on these systems, so YMMV.

> Sorry for cross-posting, I was not sure which list was more adequate.

Probably -hackers at .  Although I would have started with -questions@

-- 
Bill Moran
Collaborative Fusion Inc.