Please try 2.3.
On Wed, May 03, 2000 at 05:32:53PM -0500, Ken Teh wrote:
> I've been measuring IRQ latencies with RTL2.0 and would like to canvas
> your thoughts.
>
> A couple of years ago, I did the same thing with RTL0.6 and got some very
> impressive numbers. Here's the setup: A 200MHz Pentium M/B with an
> ISA-DIO24 (8255) card. I interrupt the card and the handler pulses an
> output pin. I measure (on a scope) the timing between these two pulses.
> With RTL0.6, I got about 2 microseconds between the two pulses.
>
> I've done the same with RTL2.0 and get 4 microseconds. I repeated the
> measurement with a PCI-DIO24 card and get the same number ~ 4us with a
> jitter of about 1us. Has anyone done similar measurements? Are these
> numbers reasonable or am I off?
>
> Btw, it's the same motherboard I used with RTL 0.6. Seems to indicate that
> RTL 2.0 has slowed down. Also, I understand from Victor that one can mess
> with the BIOS config to try and speed things up. I haven't a clue as to
> what to mess with. I'd appreciate any pointers you might have.
>
> I haven't tried task (thread) dispatching with RTL2.0, but I did this with
> RTL 0.6 and it was about 12 microseconds but with a huge variance, sometimes
> up to 30 microseconds. What can I expect with RTL 2.0?
>
> Thanks! Ken
>
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