Date: Wed, 29 Mar 2006 10:08:43 -0700 From: Scott Long <scottl@samsco.org> To: John Baldwin <jhb@freebsd.org> Cc: Bruce M Simpson <bms@spc.org>, "Conrad J. Sabatier" <conrads@cox.net>, freebsd-current@freebsd.org Subject: Re: device atpic to be deprecated? Message-ID: <442ABF1B.5040305@samsco.org> In-Reply-To: <200603291157.54467.jhb@freebsd.org> References: <20060329020527.f8f087a4.conrads@cox.net> <200603290841.50759.jhb@freebsd.org> <442AB520.5050505@samsco.org> <200603291157.54467.jhb@freebsd.org>
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John Baldwin wrote: > On Wednesday 29 March 2006 11:26, Scott Long wrote: > >>John Baldwin wrote: >> >>>On Wednesday 29 March 2006 03:51 am, Bruce M Simpson wrote: >>> >>> >>>>On Wed, Mar 29, 2006 at 02:05:27AM -0600, Conrad J. Sabatier wrote: >>>> >>>> >>>>>Is the plan still in effect to abolish this device? >>>> >>>>To my mind it wouldn't make much sense, given the sheer amount of hardware >>>>out there which doesn't have an IOAPIC, then again I'm probably out of >>>>touch with the state of interrupt handling in -CURRENT. >>> >>> >>>All amd64 machines (which is where atpic would be removed) have an APIC. >>> >> >>That's kind of like saying that ISA will be removed because there is PCI >>=-) Having an APIC doesn't necessarily guarantee that it works. There >>have been enough reports of problems on the mailing lists over time that >>I think it's a bit premature to declare the ATPIC dead. Also, is the >>ATPIC code in amd64 causing problems, holding back progress, or creating >>a maintenance burden? > > > I think that once the lapic timer stuff was added almost all of the APIC > issues I was aware of went away on amd64 that were fixed by using device > atpic instead. Most of the earlier problems were due to chipsets not > setting up pin 0 as extint, etc. but all that is no longer relevant when > we switched to using the lapic timer and stopped using irq0 and irq8 with > APIC. This is the first I've heard since the lapic timer stuff that APIC > didn't work on an amd64 box, and device atpic has been off by default in > HEAD for quite a while now. If we were able to require APIC on amd64, then > we might be able to try out some optimizations and other things I haven't > bothered with since they wouldn't be feasible on i386. > Fine, remove it. Scott
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