INTR_FAST

[Kamal R. Prasad]

because i hsve 3 spi slave devices attached to the pl022 controller and the
drain of rx queue after i initiare spi transfer is showing some
inconsistency.


On Thu, Aug 27, 2020 at 9:02 PM Ian Lepore <ian at freebsd.org> wrote:

> On Thu, 2020-08-27 at 19:20 +0530, Kamal R. Prasad wrote:
> > Hello,
> >
> >  This page
> >
> https://www.freebsd.org/doc/en_US.ISO8859-1/books/arch-handbook/smp-design.html
> >
> > says that
> > "These interrupt handlers are currently misnamed “fast” interrupt
> handlers
> > since the INTR_FAST flag used in earlier versions of the kernel is used
> to
> > mark these handlers. The only interrupts which currently use these types
> of
> > interrupt handlers are clock interrupts and serial I/O device
> interrupts."
> >
> > I want to use INTR_FAST for my spi controller, but i find that it is not
> > defined on freebsd stable11. Is INTR_EXCL related in any way to
> INTR_FAST?
> > if not, how do I setup a fast interrupt handler?
> >
> > thanks
> > -kamal
> >
>
> An important question here is:  Why do you want to use a filter handler
> (formerly called INTR_FAST) instead of a normal threaded handler?  For
> something as slow as a SPI bus, I can't imagine you're going to see any
> noticible performance difference.
>
> -- Ian
>
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