Date: Thu, 27 Aug 2020 09:32:12 -0600 From: Ian Lepore <ian@freebsd.org> To: freebsd-arm@freebsd.org Subject: Re: INTR_FAST Message-ID: <7e463a00ef89d7df0455656f51fe14f72c088a70.camel@freebsd.org> In-Reply-To: <CAK=yUG%2B5p1VAsmLtdEsFuw%2BvbsAJz55E_EV8X-ePMVZVR3p05g@mail.gmail.com> References: <CAK=yUG%2B5p1VAsmLtdEsFuw%2BvbsAJz55E_EV8X-ePMVZVR3p05g@mail.gmail.com>
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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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