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Date:      Thu, 03 May 2001 12:01:40 -0700
From:      John Merryweather Cooper <jmcoopr@webmail.bmi.net>
To:        FreeBSD-STABLE Mailing List <freebsd-stable@FreeBSD.ORG>
Subject:   Should /sys/i386/conf/GENERIC's SysV shared memory settings defaults be  re-thought?
Message-ID:  <3AF1AB14.872CBA2A@webmail.bmi.net>

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After finally getting Amanda up and running on my system, I noticed that
my cron jobs for amdump would crash with an error in SHMGET if X was
running when the amdump job was scheduled.  I have also been plagued by
IMLIB SHM memory allocation errors.  I have just discovered that, by
increasing the defaults for all the SysV settings listed in LINT, I have
been able to make all those errors disappear; and Amanda will now run to
completion even with X running.  I increased all these settings by about
a factor of x8--remembering that in OS/2 half of all physical memory was
made available for shared memory operations--giving me 32 megs of shared
memory.

In light of the fairly common use of X, should:  1) a commented out
section in generic be included with suggested settings that would work
better with X, Amanda, and the like; 2) a separate XGENERIC config file
optimized for X users; or 3) modify GENERIC to have these increased
settings by default (nice for people who run X with GENERIC kernels).

Thoughts?

jmc

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