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To: Rob Miracle <rwm@MPGN.COM>
cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Spontanious Reboots with 2.2.2 
In-reply-to: Your message of "Tue, 05 Aug 1997 12:57:10 EDT."
             <3.0.3.32.19970805125710.00822a20@central.TanSoft.COM> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Tue, 05 Aug 1997 19:50:45 -0700
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>I recently installed 2.2.2 on a couple of machines that run a very large
>application.  The machine is a Pentium Pro 200 with 256M of memory, an
>Adaptec 29xx SCSI host adapter (2949???) and a 2GB hard drive.  I have 512M
>of swap configured.  The application eats a lot of file descriptors, but
>less than the 2048 we have it configured for.  It also uses a large amount
>of SYSV Shared Memory and SYSV semaphores.
>
>It tends to spontanious reboot after a couple of hours of operation.  There
>is no message in the log files and no indication as to why.  
>
>Any easy guesses at what could be the problem?  The app ran fine under 2.2.1.

   There's a slight chance that you're running out of a resource called "PV
entries". We changed the preallocation formula between the 2.2.1 and 2.2.2
releases. Try adding this:

options		"PMAP_SHPGPERPROC=400"

   ...to your kernel config file and see if this helps. The larger number of
PV entries coupled with your large amount of physical memory might result
in other problems, however (like the system panicing at boot time due to
running out of kernel VM space).

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project