Messages in this thread | | | Subject | Re: Task queue makes slow device even slower | Date | Wed, 27 Oct 1999 16:51:53 +0100 (BST) | From | Alan Cox <> |
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> 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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