On Thursday 05 April 2001 01:06, Cort Dougan wrote:
> It's the case with all the G4's we've tested. Although not an exhaustive
> list of G4's it is a pretty large sampling. We've tested Sawtooth, Yikes
> and the newer model dual G4's. It is possible to not use the IDE at all
> and get much better timing. I've done with with initrd and NFS root.
Ok, but for the applications I have in mind, I'll need to push the drive(s)
about as hard as they can take, but OTOH...
> Do you need better timing that 16us worst-case? If so, I'd suggest testing
> with an alternate card.
>
> If you need better timing than 16us on a workstation a fast x86 should work
> for you.
...I (probably) won't even need to use RTL. The lowlatency patch should do,
at least for UP, and 16 �s should be rather acceptable either way.
(SMP complicates things a bit; it's not acceptable to just multiply the
buffering with the CPU count, because it's "high" already, and it's not
always possible to run the CPUs independently. That is, the per-CPU threads
have to run more accurately in sync.)
That is, the 16 �s shouldn't be a problem for my applications. The excessive
heat (= loud fan noise) and poor efficiency of x86 when executing DSP style
code *is* a problem though; that's why I'm looking for PPC solutions.
(If I needed CPU power only, I could build a cluster of P-III machines, but
the throughput latency requirements makes that impossible to do without RTL
and RT networking. Still interesting, though... Or how about a cluster of
Macs? :-)
//David
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