Re: Task queue makes slow device even slower
Rogier Wolff (R.E.Wolff@BitWizard.nl)
Wed, 27 Oct 1999 23:58:59 +0200 (MEST)
David Woodhouse wrote:
>
> alan@lxorguk.ukuu.org.uk said:
> > You are constrained by timer resolution. Do you have a spare timer
> > and irq you can rig for this. If not the best you can do is probably
> > to use tq_immed and at least the udelays will not impact irq latency
> It's often been suggested, and it's a long way down my TODO list,
> that we should have the facility to shift the kernel timer tick onto
> the RTC, thereby leaving the 8254 timer available for this kind of
> thing. (We can't use the RTC because its range of frequencies is
> too restricted. It's fine for timer ticks, though.)
We really should implement soft timers, especially for the project
that started this discussion (from the information I gathered from
the replies).
Roger.
--
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
"I didn't say it was your fault. I said I was going to blame it on you."
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