Date: Mon, 28 Feb 2005 18:55:34 -0600 From: Stephen Montgomery-Smith <stephen@math.missouri.edu> To: Kris Kennaway <kris@obsecurity.org> Cc: freebsd-smp@freebsd.org Subject: Re: HTT/SMP Message-ID: <4223BD86.8080705@math.missouri.edu> In-Reply-To: <20050301004441.GA49719@xor.obsecurity.org> References: <4223B9B9.5030105@math.missouri.edu> <20050301004441.GA49719@xor.obsecurity.org>
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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? > > Kris 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 that. 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. Thanks, Stephenhome | help
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