From owner-freebsd-hackers Fri May 31 6:24:42 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from tesla.distributel.net (nat.MTL.distributel.NET [66.38.181.24]) by hub.freebsd.org (Postfix) with ESMTP id 9428D37B401; Fri, 31 May 2002 06:24:36 -0700 (PDT) Received: (from bmilekic@localhost) by tesla.distributel.net (8.11.6/8.11.6) id g4VDNmd69563; Fri, 31 May 2002 09:23:48 -0400 (EDT) (envelope-from bmilekic@unixdaemons.com) Date: Fri, 31 May 2002 09:23:48 -0400 From: Bosko Milekic To: Aaro J Koskinen Cc: freebsd-hackers@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG Subject: Re: ICU_LEN with IO APIC Message-ID: <20020531092348.B69469@unixdaemons.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from akoskine@cc.helsinki.fi on Fri, May 31, 2002 at 12:12:00PM +0300 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 On Fri, May 31, 2002 at 12:12:00PM +0300, Aaro J Koskinen wrote: > Hello, > > 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?!" :-) > A. > > -- > Aaro Koskinen > E-mail: aaro@iki.fi "I'm the ocean, I'm the giant undertow." > http://www.iki.fi/aaro Regards, -- Bosko Milekic bmilekic@unixdaemons.com bmilekic@FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message