On Fri, Jul 09, 1999 at 07:47:56PM -0600, Victor Yodaiken wrote:
>
> It's bad enough that David could present such a hideous hack, but now
> you want to follow his lead. Don't you know that this kind of work leads
> evetually to installing WinCE or even worse?
Ha ha. I'm (almost) rolling on the floor laughing at this...
Personally, I think it is a hideous hack to use an 8254 in one-shot
mode, an/or to use the ISA bus on a 400 Mhz computer. And I've not
had someone show me that the IO-APICs are actually capable of decent
timing. IO-APICs have been on motherboards for several years, yet
Linux still does not have an earliest-deadline first timer interrupt
except with the UTIME patch, which uses the XT-PIC.
What I want (what is needed) is a timer that a) counts continuously,
like the TSC, and b) can trigger interrupts when the timer reaches
a certain, programmable value, and c) is not on the ISA bus. I only
suggest stupid stunts because these features are not available (to
my knowledge) on standard PC hardware. If I am wrong, then it's
about time for me to shut up and start writing a patch. One shot
timers are not adequate, since you might miss any number of timer
ticks between when you get the interrupt and when you reprogram
the timer, even if you have low latency.
dave...
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