kris at obsecurity.org
Tue Mar 1 01:04:02 GMT 2005
On Mon, Feb 28, 2005 at 06:55:34PM -0600, Stephen Montgomery-Smith wrote:
> Kris Kennaway wrote:
> >On Mon, Feb 28, 2005 at 06:39:21PM -0600, Stephen Montgomery-Smith wrote:
> >>I have a dual Xeon system, for which I had hyperthreading enabled. I
> >>was running a CPU intensive floating point program (specifically using
> >>the fftw3 port with threads). I found that using 4 (hyper) processors
> >>really did give me a speed advantage, even though I do find web sites
> >>that suggested this advantage was minimal. (So for example, 4 processes
> >>on this system seemed to run at the equivalent of 2GHz on these 3GHz
> >>computers, so the advantage was about 1.3 times.)
> >>But then after about a day the computer had a panic. I found that 4
> >>CPU's under FreeBSD 5.3 is apparently unstable, and there were
> >>statements to the effect that this would be fixed in FreeBSD 5.4. Is
> >>this going to happen? I am currently running a rather recent version of
> >>FreeBSD 5.3-Stable, maybe a week or two old, so I am concerned that
> >>maybe this won't get committed.
> >Depends on the panic. What was it?
> I'm sorry, but I didn't write it down. Something about a page being
> messed up or something. Since I had already seen messages to the effect
> that HTT on dual processors had problems, I assumed that it was just
I run HTT on a dual processor machine and have not experienced
> I can tell you that I now have HTT disabled, and it is not
> panicing at all.
> Was there some fix committed (which would suggest that maybe this is
> some other problem)? If so, I could reenable HTT and wait for another
> panic to occur, and then write it down.
You should set up crashdumps as described in the developers' handbook
and get a full trace.
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