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Date:      Mon, 20 Sep 1999 06:13:51 -0700 (PDT)
From:      pawel@paco.umcs.lublin.pl
To:        freebsd-gnats-submit@freebsd.org
Subject:   i386/13857: Problem with switching between processes when using SMP kernel
Message-ID:  <19990920131351.4777814BF2@hub.freebsd.org>

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>Number:         13857
>Category:       i386
>Synopsis:       Problem with switching between processes when using SMP kernel
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 20 06:20:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Pawel Bryk
>Release:        3.2-RELEASE
>Organization:
MCS University
>Environment:
FreeBSD miki.umcs.lublin.pl 3.2-RELEASE FreeBSD 3.2-RELEASE #0: 
Fri Sep  3 22:39:59 GMT 1999     
dragon@miki.umcs.lublin.pl:/usr/src/sys/compile/DRAGON1  i386
>Description:
My system: ASUS P2B-DS (BX chipset), dual PIII 450MHz, Matrox G200, 256MB RAM, Intel
Etherexpress 10/100 PCI card, FreeBSD 3.2-R.
When running two or more jobs with SMP kernel that use a lot of CPU
time, the screen freezes, reboot and login commands take forever, etc.
Ps and top commands show 0.0% of CPU usage.
If the same jobs are running on only one processor (i.e. with disabled
SMP and APIC options in kernel) everything is fine.
I have a similar machine (ASUS P2L97-DS, LX chipset, 3.0-R) 
and was able to boot kernel from P2L97 on P2B mobo. Freezing effects
remains. I've also got a message from one person that uses P2B-DS and
he emailed me his version of a kernel configuration file. I have 
recompiled kernel with these options but it didn't help. 
My first impression was that this is a motherboard failure but
I have installed Linux (Debian) and all problems disapeared :(
Finally I've contacted with my vendor and I was told that this
motherboard is a version especially for PIII, i.e it won't work 
with PII (I've checked it, it's true). 
My feeling is that ASUS something changed with the design of P2B-DS
and this causes the problem.


>How-To-Repeat:
Install FreeBSD on a SMP machine with ASUS P2B-DS motherboard that
works only with PIII, then run any two or more programs eating CPU time.
>Fix:
Renice jobs to 15 or install Linux.
Both solutions are unacceptable.

>Release-Note:
>Audit-Trail:
>Unformatted:


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