First my apologies for sending an empty message of help to the list earlier today.

I was trying to obtain subscription info. :-)

Onto the problem:

I have a Dell Precision 220 with 256 megs of RDRAM. Non-ECC. The 220 is in a desktop case with a 230 watt power supply. The system has a LSI-Logic dual channel SCSI host adapter with an ultra-160 SCSI 10K RPM drive. The graphics card is a Matrox dual head G450.

Two 866 Mhz PIII's (retail boxed processors) with the same stepping.

I am running FreeBSD 4.7. The kernel is configured to run SMP with the only other option being a PCI sound device.

If I enable the second CPU I get SIGSEGV's on cc1 while building emacs. Also when unzipping files or running gzip --test I get CRC errors.

I can run the same gzip --test or try recompiling and it will work. If the second CPU is disabled I never have any problem occur.

Checking the list archives (http://docs.freebsd.org/cgi/getmsg.cgi?fetch=411776+0+archive/2001/freebsd-stable/20010114.freebsd-stable) someone suggested that the CPU's run hotter in SMP mode and that better cooling would solve the problem.

I have swapped the CPU's between slots as well as the memory and this has had no effect on the problem.

I also changed out the exhaust fan that cools the CPU's to one that moves a lot more air. This changed nothing.

I have run memtest86 (available on sourceforge.net) for three hours. I have also run the Dell diagnostics. Both programs did not find any problems.

So has anyone else run into this problem? What if anything did you do to solve it? Any recomendations on how to go about debugging this problem?

Thanks and happy holidays, Marc

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