Date: Mon, 03 Feb 1997 22:42:09 +0800 From: Peter Wemm <peter@spinner.dialix.com> To: Kenneth Merry <ken@housing1.stucen.gatech.edu> Cc: Terje.N.Marthinussen@cc.uit.no (Terje Normann Marthinussen), smp@csn.net, smp@freebsd.org Subject: Re: Current SMP status inquiry Message-ID: <199702031442.WAA08729@spinner.DIALix.COM> In-Reply-To: Your message of "Tue, 28 Jan 1997 12:15:26 EST." <199701281715.MAA22280@housing1.stucen.gatech.edu>
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[I've been out of action for ~2 weeks and still catching up..]
Kenneth Merry wrote:
> Terje Normann Marthinussen wrote...
[..]
> > While not FPU intensive, it most certainly must have used quite a bit of
> > FPU during the ~15 hours the processes ran (well, actually two runs
> > of ~15 hours, a bug was discovered ;)). Didn't notice any problems at all.
>
> I agree, I can run FP intensive stuff, like ICO, OpenGL demos, and
> all kinds of stuff without problems. I've been running X without trouble,
> ever since I figured out I needed to get rid of the FP emulation stuff in
> the kernel. (I accidentally left it in my config file.) The question,
> though, is can you run this program successfully?
>
> ========================================================================
> #include <sys/types.h>
> #include <signal.h>
> void blech() { exit(3); }
> main()
> {
> int i32;
> double f;
> int result = 0;
> signal(SIGFPE, blech);
>
> f = (double) 0x7fffffff;
> f = 10 * f;
> i32 = (int) f;
>
> if (i32 != (int) f)
> result |= 1;
> exit(result);
> }
> ========================================================================
>
> That program locks my machine up solid. (I got it from the perl5
> configuration script, after several attempts to compile the port hung my
> machine.)
It looks to me that the problem with the fpu stuff might be more a
function of FPU error handling (irq13 vs. IDT trap #16) rather than just
plain floating point operations...
>
> Ken
> --
> Kenneth Merry
> ken@ulc199.residence.gatech.edu
> Disclaimer: I don't speak for GTRI, GT, or Elvis.
Cheers,
-Peter
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