Date: Wed, 14 Aug 2002 16:20:03 -0700 (PDT) From: Bruce Evans <bde@zeta.org.au> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/40636: PCI devices don't share IRQs. Message-ID: <200208142320.g7ENK3Kw068345@freefall.freebsd.org>
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The following reply was made to PR kern/40636; it has been noted by GNATS. From: Bruce Evans <bde@zeta.org.au> To: Matthew Emmerton <matt@gsicomp.on.ca> Cc: freebsd-gnats-submit@FreeBSD.org, <jon@FreeBSD.org>, <bde@FreeBSD.org> Subject: Re: kern/40636: PCI devices don't share IRQs. Date: Thu, 15 Aug 2002 09:20:23 +1000 (EST) On Wed, 14 Aug 2002, Matthew Emmerton wrote: > How is this a duplicate of kern/20523? That PR deals with multi-port PCI > serial devices, where this just deals with single-port PCI serial devices -- > unless it's just a generalization. > > The originator of kern/40636 has not seen any performance problems with my > patch, so unless sharing intr_fast (whatever the heck that is -- I can't > find any mention of that in the sio.c file) is some very bad thing to do, I > don't see a problem with my patch. > > Can someone please clarify? See my earlier reply. (intr_fast is a misspelling of INTR_FAST in -current and INTR_TYPE_FAST in older versions. Not using it tends to give you silo overflows. I think the patch is better than nothing but it only helps if the sio device happens to be attached after another device that shares the irq. The INTR_*_FAST BUS_SETUP_INTR() call must be removed to get deterministic behaviour and doing that clearly breaks fast interrupts always.) Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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