From owner-freebsd-hackers Tue Dec 11 21:16:24 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from rover.village.org (rover.bsdimp.com [204.144.255.66]) by hub.freebsd.org (Postfix) with ESMTP id 4370537B405; Tue, 11 Dec 2001 21:16:21 -0800 (PST) Received: from harmony.village.org (harmony.village.org [10.0.0.6]) by rover.village.org (8.11.3/8.11.3) with ESMTP id fBC5GJa83812; Tue, 11 Dec 2001 22:16:19 -0700 (MST) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (localhost [127.0.0.1]) by harmony.village.org (8.11.6/8.11.6) with ESMTP id fBC5GJM33101; Tue, 11 Dec 2001 22:16:19 -0700 (MST) (envelope-from imp@harmony.village.org) Message-Id: <200112120516.fBC5GJM33101@harmony.village.org> To: Terry Lambert Subject: Re: irq Cc: Danny Braniss , Bernd Walter , Mike Smith , freebsd-hackers@FreeBSD.ORG In-reply-to: Your message of "Tue, 11 Dec 2001 06:14:45 PST." <3C1614D5.B5C3B4C5@mindspring.com> References: <3C1614D5.B5C3B4C5@mindspring.com> Date: Tue, 11 Dec 2001 22:16:19 -0700 From: Warner Losh 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 In message <3C1614D5.B5C3B4C5@mindspring.com> Terry Lambert writes: : Some cards do not have a hardware "I caused an interrupt" register, : and use a differential (e.g. ring head vs. tail inequal after : interrupt) to tell if there is work to do. If these cards were to : share interrupts, then they most likely do work every interrupt, : and less work per interrupt, then would otherwise be the case (i.e. : it would defeat hardware interrupt coelescing thresholds, among : other things). No such PCI cards can exists. The PCI spec requires that interrupt sharing work. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message