FreeBSD unstable on Dell 1750 using SMP?
stephen at math.missouri.edu
Wed Nov 30 05:50:14 GMT 2005
Dan Charrois wrote:
> It actually may be a comfort, since perhaps HTT is related to the
> culprit. Since the last crash, about a month ago, I disabled HTT, both
> in the kernel as well in the BIOS. So as far as I know, it's
> completely been disabled (and the boot messages and top only show 2
> CPUs). And I haven't had the system go down for nearly a month now.
I don't know if it is related, but I used to have random reboots on a
dual Xeon system with HTT enabled. It happened when I ran a CPU
intensive threaded program at the same time as "top" - running "top -s0"
(which you have to do as root) could usually kill the machine in seconds
if not minutes.
All I can tell you is that with FreeBSD 6.0 the problem disappeared.
Well not totally - I still get a bunch of harmless calcru negative
messages, although I don't know if it is actually related to the boot
problems I used to have with FreeBSD 5.4, because I get the calcru
backwards messages even with HTT disabled.
Anyway, if you are in the mood to try it out, you might like to try
re-enabling HTT, starting up whatever process you usually use (I'm
guessing it is MySQL), and then run "top -s0". If you get a crash soon
after that, you have the same problem I had.
Let me also add that these crashes usually did not trigger a crash dump
(I had dumpon set), and when it did the resulting dump looked rather
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