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

> 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@. Although I would have started with -questions@

--
Bill Moran
Collaborative Fusion Inc.


Mr Moran, did you set up any other sysctl mib such as the mentioned ones?

I have raised it to "500". If I set lower values, around 400 I start
getting a huge flood of:

collecting pv entries -- suggest increasing PMAP_SHPGPERPROC
collecting pv entries -- suggest increasing PMAP_SHPGPERPROC

Specially on "apachectl graceful" signaling. If I raise it over 500 my
system panics on boot.

I still get "collecting pv entries -- suggest increasing
PMAP_SHPGPERPROC" at the current setup value, however not very often.


--
===========
Eduardo Meyer
pessoal: dudu.meyer@xxxxxxxxx
profissional: ddm.farmaciap@xxxxxxxxxxxx
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