From owner-freebsd-current@FreeBSD.ORG Fri Mar 11 22:52:00 2005 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 55A3216A4CE for ; Fri, 11 Mar 2005 22:52:00 +0000 (GMT) Received: from av5-2-sn3.vrr.skanova.net (av5-2-sn3.vrr.skanova.net [81.228.9.114]) by mx1.FreeBSD.org (Postfix) with ESMTP id BF83B43D31 for ; Fri, 11 Mar 2005 22:51:59 +0000 (GMT) (envelope-from daniel_k_eriksson@telia.com) Received: by av5-2-sn3.vrr.skanova.net (Postfix, from userid 502) id 9CB1C37E5F; Fri, 11 Mar 2005 23:51:58 +0100 (CET) Received: from smtp1-1-sn3.vrr.skanova.net (smtp1-1-sn3.vrr.skanova.net [81.228.9.177]) by av5-2-sn3.vrr.skanova.net (Postfix) with ESMTP id 8CBC437E44 for ; Fri, 11 Mar 2005 23:51:58 +0100 (CET) Received: from sentinel (81-232-139-217-no23.business.telia.com [81.232.139.217]) by smtp1-1-sn3.vrr.skanova.net (Postfix) with ESMTP id 612B738009 for ; Fri, 11 Mar 2005 23:51:58 +0100 (CET) From: "Daniel Eriksson" To: "'FreeBSD Current'" Date: Fri, 11 Mar 2005 23:51:40 +0100 Organization: Home Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.6353 Thread-Index: AcUmjONYeYvGeUIJQai718XI7RjoYA== X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Subject: Higher interrupt rate after recent SMP/APIC timer changes? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Mar 2005 22:52:00 -0000 After the recent changes to the use of APIC timers on SMP systems, the reported interrupt rate has gone up significantly: # vmstat -i interrupt total rate irq1: atkbd0 3 0 irq0: clk 55294842 1998 irq4: sio0 656 0 irq6: fdc0 13 0 irq13: npx0 1 0 irq14: ata0 28299 1 irq15: ata1 28144 1 irq17: atapci1+ 60822 2 irq19: atapci3+ 19848 0 irq20: ciss0 857173 30 irq21: em0 1 0 irq22: em1 1 0 lapic1: timer 110665583 3998 lapic0: timer 110649350 3998 Total 277604736 10031 This is an SMP box (dual AMD AthlonMP) running with HZ=2000 and POLLING enabled. Should I worry about the 4k intr/sec reported for lapic0 and lapic1, or is this the way things should be? I should add that system load has not changed noticeably, leading me to believe that the lapic* interrupt rate is by design and nothing to worry about. (But I still wanted to ask.) /Daniel Eriksson