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SubjectRe: Microsecond resolution timers - final word
Hi Robert.

>> When you say "modify the hardware", do you mean just the device
>> at the far end of the wire, or the PC as well?

> Annoyingly, neither. There's a couple of friends of mine who
> have similar hardware, but don't want to change anything. And
> same goes for me. Besides, I have code for dos that will work
> with it, this microsecond stuff is the only hurdle I have to
> overcome.

> Incidentally, the dos version does its timing using the hardware
> timer at 0x40-0x5f...

Presumably via a driver that plugs itself in there, then resets the
timer to spin faster and only passes through every 100th (or whatever)
tick to the routine behind it...

> ...though I don't think I'm allowed to do that.

Nope, but you might wish to have a look at the various patches that
raise Linux's HZ rate as those also allow suchlike increases to take
place in a compatible manner...

> Thanks for the ideas though :)

No problem...

Best wishes from Riley.

+----------------------------------------------------------------------+
| There is something frustrating about the quality and speed of Linux |
| development, ie., the quality is too high and the speed is too high, |
| in other words, I can implement this XXXX feature, but I bet someone |
| else has already done so and is just about to release their patch. |
+----------------------------------------------------------------------+
* ftp://ftp.MemAlpha.cx/pub/rhw/Linux
* http://www.MemAlpha.cx/kernel.versions.html


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