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Date: Wed, 6 Aug 1997 08:52:13 -0500 (CDT)
From: "M. L. Dodson" <bdodson@beowulf.utmb.edu>
Message-Id: <199708061352.IAA09932@beowulf.utmb.edu>
To: rwm@MPGN.COM, dg@root.com
Subject: Re: Spontanious Reboots with 2.2.2
Cc: freebsd-questions@FreeBSD.ORG
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I am also planning to run a large application (estimated 1GB swap) on a
new 128MB PPro.  Would it be possible for one of the kernel/VM/core people
to put down a list of the "gotchas" those of us planning this type of
application mix might run into?  

TIA,
Bud Dodson

> 
> >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
> 

--
M. L. Dodson                                bdodson@scms.utmb.edu
409-772-2178                                FAX: 409-772-1790