I have been troubleshooting reboots over the last weekend, I think I might have enough clues now to get some useful hints from an expert.
FreeBSD 5.3-release (see dmesg below for details)
The problem seems to be with trying to run with 1.5GB vice 512MB of RAM. The system has not had problems so far when I only leave the 512MB stick in. When I add the 1GB stick the system will reboot at specific times, for example, while trying to launch KDE3 or trying to make OpenOffice (always reboots at "Extracting for openoffice-1.1.2-1"). I do not see any panic in the messages log, the system just silently reboots.
I initially installed FreeBSD with only the 512MB stick in.
The memory itself seems fine; memtest86 detects no errors.
At boot time all the memory is detected:
real memory = 1610547200 (1535 MB) avail memory = 1568432128 (1495 MB)
Running "memtest all" only seems to find 512MB to use. It evidently makes no assumption about how much memory is there, starting by trying to malloc 4GB and reducing the amount gradually until it finally successfully mallocs 512 MB and eventually manages to lock 413 MB (failed due to "insufficient resources" above that). The tests on the 413 MB do pass.
I have rebuilt the kernel with VM_KMEM_SIZE_MAX=419430400 as suggested in the FAQ. No change.
Would setting MAXMEM to 1572864 help? I am not sure since the correct amount is reported by FreeBSD at boot, and right now trying to make the kernel with that option seems to be another case that reboots the machine (i.e. the make process itself reboots the machine) so I have not tried it yet (guess I would have to remove the 1GB stick to make the new kernel and then put it back to try it out).
Thank you for any help.
What happens with just the gig stcik? What happens when you switch the slots the sticks are in? Are the sticks the sam brand? Are the brands/brand supported? http://www.sis.com/support/support_memory_3.htm
Are you overclocking?
intersresting read on the sis memory controller http://www.lostcircuits.com/motherboard/asus_p4s333/
I also find it hard to believe you have a bad mptable. Maybe you could check for a new bios? It is kind of funny if sis used the ms acpi tools and not intels for an intel system. I say this because I have never heard of problems from the intel acpi tools, and ms is the only other set I know of.
============ dmesg ============
FreeBSD 5.3-RELEASE #1: Sun Mar 13 20:01:36 PST 2005
xxxxxxxxxxxxxxxxx:/usr/src/sys/i386/compile/KERNEL_JEAN
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) 4 CPU 2.20GHz (2205.01-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf24 Stepping = 4
Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM>
real memory = 1610547200 (1535 MB)
avail memory = 1568432128 (1495 MB)
mptable_probe: MP Config Table has bad signature: .\M^K\M-@
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