Date: Fri, 31 May 2002 14:06:17 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Bosko Milekic <bmilekic@unixdaemons.com> Cc: Aaro J Koskinen <akoskine@cc.helsinki.fi>, freebsd-hackers@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG Subject: Re: ICU_LEN with IO APIC Message-ID: <3CF7E5C9.82526E0A@mindspring.com> References: <Pine.OSF.4.30.0205311112190.30721-100000@sirppi.helsinki.fi> <20020531092348.B69469@unixdaemons.com>
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Bosko Milekic wrote: > On Fri, May 31, 2002 at 12:12:00PM +0300, Aaro J Koskinen wrote: > > Is there any particular reason why the number of interrupts is limited > > to 32 on APIC systems? Is it just a conservative guess on the number of > > interrupts anyone might want to need...? > > I'm not sure but perhaps this is historical (and now also required > again), but if we use a word to mask out interrupts than after 32 we > run out of bits. "Who needs more than 32 interrupts anyway?!" :-) Who needs more than 4? Foo on PCI. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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