Messages in this thread | | | From | "Manfred Spraul" <> | Subject | Re: doing a callback from the kernel to userspace | Date | Mon, 12 Nov 2001 19:27:14 +0100 |
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> > PS: Yes, I really do need this as signals form the kernel to userspace > add to much latency (10 to 20 usecs) and I want to avoid waiting > in a system call.
The latency you talk about is the time required to schedule - there is nothing you driver can do to reduce that - syscall, signal or your own code must wait until schedule() decides to run your process.
I'd try to a) switch your process to realtime priority, mlockall your app. b) use the low-latency patches. They were regularly discussed on linux-kernel, search through the archives. c) give up and implement everything in kernel. d) switch to rtlinux.
Are you sure you need 10 to 20 usec? Then a hard realtime with everything in kernel is your only option, i.e. rtlinux.
-- Manfred
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