On Monday 12 March 2001 02:58, C. W. Wright (1698) wrote:
> > > Has anyone examined the new 1.5gHz Pentium Pro-IV systems for
> > > linux/rtl performance? Are there any issues that would suggest
> > > increase or decrease in real-time (or non-realtime) performance? My
> > > current rtl project is working fine on a 600mHz Athlon, but extra CPU
> > > horsepower would permit some system enhancements.
> >
> > why not use a 1.2 GHz athlon than ?
>
> I can't think of a reason not too use one; however, if the P-4 runs at
> 1.5gHz and has additional enhancements such as fewer clocks per
> instruction, more instructions, registers ( it has a bunch more floating
> point registers than pentium-pro-3, athlon), faster front-side bus, bigger
> cache, etc. etc. and perhaps it's the direction things will migrate, then
> it may make sense to go in that direction instead of the 1.2 gHz athlon.
AFAIK, P-IV still runs only with RDRAM - which is a serous issue *especially*
for latency critical things like RTLinux. RDRAM access is slow enough that
it's a general system performance issue, allowing PC-133 based systems to
outperform RDRAM systems despite the several times higher bandwidth.
(Looks like someone *really* didn't have a clue as to what kind of work the
average computer does... Only huge operations on physically contigous memory
blocks benefit from higher bandwidth at the expense of latency - all other
code [ie any normal application, and *especially* real time applications] is
penalized.)
> I have a couple of Athlon 1.1gHz machines which we've just installed RH
> 6.2 on with unusual difficulty. The generic installed RH6.2 kernel
> crashes and dumps the registers. We got it running with a custom kernel
> from my 600mHz athlon system and then building a custom one for the
> machine.
I'm not sure RH 6.2 comes with precompiled Athlon kernels. If not, it might
be trying a P-II/III optimized kernel instead, thus guaranteeing the crash to
happen, as most things added to the Pentium instruction set are incompatible.
In other words; you *must* use a kernel compiled for the right CPU - or fall
back to pure 386/486 code. (I'm not even sure the Pentium optimizations would
work on AMD...)
//David
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