From owner-freebsd-hackers Fri May 31 14: 7:23 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from snipe.mail.pas.earthlink.net (snipe.mail.pas.earthlink.net [207.217.120.62]) by hub.freebsd.org (Postfix) with ESMTP id 0F90037B415; Fri, 31 May 2002 14:06:58 -0700 (PDT) Received: from pool0324.cvx40-bradley.dialup.earthlink.net ([216.244.43.69] helo=mindspring.com) by snipe.prod.itd.earthlink.net with esmtp (Exim 3.33 #2) id 17Dtbl-00006g-00; Fri, 31 May 2002 14:06:49 -0700 Message-ID: <3CF7E5C9.82526E0A@mindspring.com> Date: Fri, 31 May 2002 14:06:17 -0700 From: Terry Lambert X-Mailer: Mozilla 4.7 [en]C-CCK-MCD {Sony} (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Bosko Milekic Cc: Aaro J Koskinen , freebsd-hackers@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG Subject: Re: ICU_LEN with IO APIC References: <20020531092348.B69469@unixdaemons.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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-hackers" in the body of the message