Re: Spontanous reboots

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1 total messages Started by "O. Hartmann" Fri, 12 Feb 1999 00:00

#3912

Author: "O. Hartmann"
Date: Fri, 12 Feb 1999 00:00

66 lines
2996 bytes

In some messages I read that some users of FBSD 3.0-STABLE have
had problems with spontanous reboots. Well, we use FBSD 3.0-stable
as a server OS for our double PII system and for the printserver,
a small 486DX2-66 box with 32 MB RAM. After upgrading to 3.0-stable
both systems turned into this crazy behavour of booting without 
any error messages, and on booth systems it seemed that the rhythmn
of "rebooting" was about 60 or 70 minutes. When I started a rebuild
of the system on the mainserver, this occurance of this obscure error
came much faster than within the usual 60 minutes. The compiler died, the
system stoped and rebooted.

I fixed the problem by changing the value of an new kernel option.
Well, I don't know whether this is the solution for the many similar
problems reported here, but it fixed my problems!

The new kernel option is

options         "PMAP_SHPGPERPROC=201"

In LINT it is set to 201, default seems to be 200. Well, my understandings
of kernel functionality is not clear and "enriched", but for the case I'm right:
this option defines the value of "preallocated" pages for EACH process forked
and started. The intention seems to be speeding up starts of processes on
heavy duty servers with a lot of memory. We use 256MB RAM on our server and
I played around with the option and pushed the value towards 288 - since then
the system turned into spontanous reboots! Now I use a value of 208 for
our system, and I decreased the value for our printserver - since then the
crazy behaviour stopped.

I hope this helps.


Gruss O. Hartmann
-------------------------------------------------------------------
harto000@mail.uni-mainz.de
ohartman@ipamzlx.physik.uni-mainz.de

i.A. Systemadministration IPAMZLX
Klimadatenserver des IPA, Unisversitaet Mainz


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