Re: Task queue makes slow device even slower
Alan Cox (alan@lxorguk.ukuu.org.uk)
Wed, 27 Oct 1999 16:51:53 +0100 (BST)
> The solution is to break up the write routine and use a task queue
> fucntion instead, but this makes the device even slower (visibly, that
> is). Each run of the task queue selects the next state in the LCD
> protocol. If we use the timer task queue it is just plain slow, if we use
> the scheduler task queue, the speed depends on the number of processes.
>
> Is it possible to get the device faster without having to use udelay()?
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
>
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