Date: Fri, 4 May 2001 10:07:27 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: John Merryweather Cooper <jmcoopr@webmail.bmi.net> Cc: David Petrou <dpetrou@cs.cmu.edu>, 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: <200105041707.f44H7Rw26684@earth.backplane.com> References: <20010503221951.G47670@amant.pdl.cs.cmu.edu> <200105041614.f44GEsb25774@earth.backplane.com> <3AF2DBFD.37AA2124@webmail.bmi.net>
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:>
:> 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
:
:Excellent! Other than larger swap usage, I haven't seen a downside to
:my settings (although I think they're a little on the large end)
:Performance with graphics, particularly with xscreensaver seems much
:improved though.
:
:jmc
Could you do me a favor and post your 'ipcs -a' output for the case
of your nominally heavy X load?
I am looking to raise the SHMMAXPGS default from 1024 to 8192,
SHMMNI from 96 to 192, and SHMSEG from 64 to 128. The question is
whether I have to raise SHMMNI and SHMSEG even higher -- I'm guessing
that your problems were mostly due to the too-low SHMMAXPGS default.
-Matt
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