[RC5] athlon slooooow

John Campbell jcampbel at lynn.ci-n.com
Sat Mar 4 15:38:00 EST 2000

On Fri, 3 Mar 2000, john wrote:

> hi, i just got an athlon 700 and while im aware that there is no athlon
> optimized core yet, i really thought it would be able to at least brute
> force better than im seeing.  i benchmarked all cores in the current dnetc
> client and can do no better than 301,000 keys/s.  i thought i was reading
> it wrong at first, but that is indeed the case.  then i thought maybe the
> bench was just off, ran it for a bit and never broke 300 kkeys/s.  this
> machine is running win98.  my sun ultra5 running redhat does better than
> this athlon...its a sad sad day.  anyone know wtf?

	I'm not sure what the problem is, exactly, but my K7 did the same
thing when I first set it up. Mine's a 0.18 micron 650 on an FIC SD-11
running Slackware 7.0. First RC5 benchmark was at about 200kk/s. I repeated
it a couple of times, with the same results. I recompiled the kernel (which
took a little over 12 minutes), rebooted with the new kernel, and tried it
again... second time around it ripped through the benchmark at just a hair
under 2Mk/s. I recompiled the kernel again (full rebuild with the same
settings) just for fun... 2 minutes, 15 seconds.

	So it's not just the RC5 client that's affected... kernel compiles
were as well, and other compiles seemed slow too, though the kernel is the
only one I got hard numbers on. Oddly, the bogomips hang right at 647
whether it's decided to be slow or fast. A reboot seems to have solved the
problem, and it's been happily cranking away at 2Mk/s ever since, even after
a couple of reboots. I'm not sure if it's the new kernel (686-optimized,
where the Slackware installation kernel was 386-optimized) or what, and I've
not had the urge to mess around with it to find out. If it is the kernel,
I'm not sure what you'd do to solve that in Windows...

John Campbell
jcampbel at lynn.ci-n.com

QotD:  The goal of Computer Science is to build something that will last at
least until we've finished building it.

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