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: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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