Date: Fri, 4 May 2001 09:14:54 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: David Petrou <dpetrou@cs.cmu.edu> Cc: Antoine.Beaupre@ericsson.ca, freebsd-stable@FreeBSD.ORG Subject: Re: Should /sys/i386/conf/GENERIC's SysV shared memory settings+defaults be re-thought? Message-ID: <200105041614.f44GEsb25774@earth.backplane.com> References: <20010503221951.G47670@amant.pdl.cs.cmu.edu>
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:..
:> while now, on a Pentium 166Mhz with 32M but around 100-150Mb or swap.
:>
:> Never had problems with SHM.
:
:i've commented about the problems with shm and a heavy enlightenment /
:gnome load a few weeks ago to stable, but my message was pretty much
:ignored. also note that this issue has been brought up in current a
:year or so ago.
:
:my problems went away with:
:
: options SHMMAXPGS=8192
: options SHMMNI=4096
: options SHMSEG=1024
:
:i don't know enough about the internals to know the downside for using
:these high values, but i'm pretty confident on today's architectures
:...
:
:david
In general there is no downside. Shared memory is swap-backed
(though the in-kernel control structures are not).
I think it's high time that the system defaults be raised. I'll do
it later today. You should also be able to raise the defaults
using appropriate sysctl's, e.g.:
sysctl -a | fgrep kern.ipc
sysctl -w kern.ipc.shmmax=33554432
And, of course, with kernel conf variables.
-Matt
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