On Saturday, April 13, 2002, at 08:52 AM, Gregg Eshelman wrote:
>
> --- Mark Benson <[EMAIL PROTECTED]> wrote:
>> Well turning off both the PowerCache and PowerMath
>> options drops FPU
>> performance from 0.381 to 0.280 average (1 = Quadra
>> 605). I think that
>> shows a difference - don't you? That's a 33% speed
>> drop in FPU processes.
>
> What about the CPU performance? With PowerCache off
> it should be running on the logic board's CPU and
> FPU. Try the test with just PowerCache on.
Not likely considering I took the original 030 off to put the upgrade
board on :) Just to make it absolutely clear for the fifth time so
everyone knows, this PowerCache card is a CPU socket upgrade *not* a PDS
expansion card (that has an Asante LAN card in it), remember this is an
SE/30, not a IIci. As I stated in the last results post (may not have
been clear), leaving the PowerCache switch ON and the toggling the
PowerMath switch (rebooting in between) makes *no difference* to the FPU
performance. I presume, seeing as it's a CPU replacement board the
PowerCache switch turns off the other board funtions (50MHz FPU, 32k
Cache etc.) and runs with the on-board FPU and the 50MHz 030.
> Does the boot process jump in speed when the Power
> Central CP loads when you have both switches Off?
It doesn't jump in speed ever because the machine can't swap for the
16MHz to the 50MHz CPU, the 16MHz CPU is in a box under my bed 300 miles
away ;).
> If it doesn't then the accelerator is disabled and
> you're using it as just a 32K cache card.
As I say it more likely shuts off all the functions and just uses the
50MHz CPU and the 16MHz FPU, hence the drop in FPU performance.
I think that all proves the FPU on a PowerCache card is better than the
on board FPU (or the FPU emulation on a non-FPU machine). As for SANE
calls I don't know unless I can locate a SANE specific benchmark or
something that specifically allows SANE to be analysed. Would TechTool 2
do it?
--
Mark Benson
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