On Sat, Mar 27, 1999 at 08:43:25AM -0600, Pierre Cloutier wrote:
> USER SPACE SHMEM. RTL KERNEL
>
> stuff the buffer ---->
> soft int xx
> int
> handler wakes up
Why not use syscall? That is a soft interrupt. On the x86 you could bypass
the linux syscall code with a different argument to "int", but I don't see
what is gained and I do see what is lost.
What you might prefer is a rtl_fifo mode that used shared memory so that
read/write did no copying. But I have not yet seen a good benchmark showing
that the fifo _is_ a bottleneck. Is there such an example?
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