From owner-freebsd-ipfw@FreeBSD.ORG Wed Feb 23 15:52:23 2011 Return-Path: Delivered-To: ipfw@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 39ACE106564A for ; Wed, 23 Feb 2011 15:52:23 +0000 (UTC) (envelope-from eksffa@freebsdbrasil.com.br) Received: from capeta.freebsdbrasil.com.br (capeta.freebsdbrasil.com.br [201.48.151.3]) by mx1.freebsd.org (Postfix) with SMTP id 692968FC16 for ; Wed, 23 Feb 2011 15:52:22 +0000 (UTC) Received: (qmail 68889 invoked from network); 23 Feb 2011 12:25:40 -0300 Received: by simscan 1.4.0 ppid: 68884, pid: 68887, t: 0.0032s scanners:none Received: from unknown (HELO eksffa-mac.bh.freebsdbrasil.com.br) (eksffa@freebsdbrasil.com.br@201.48.151.226) by capeta.freebsdbrasil.com.br with ESMTPA; 23 Feb 2011 12:25:40 -0300 From: Patrick Tracanelli Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Date: Wed, 23 Feb 2011 12:25:39 -0300 Message-Id: <8B6C1E5B-F1EA-46DC-816B-27F204449C32@freebsdbrasil.com.br> To: ipfw@freebsd.org Mime-Version: 1.0 (Apple Message framework v1082) X-Mailer: Apple Mail (2.1082) Cc: Subject: Excessive "intr" CPU usage caused by Dummynet X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Feb 2011 15:52:23 -0000 Hello Gentlemen, What may cause dummynet to exaust CPU cycles on kernel "intr" requests? I am facing a situation where "top -S" shows something like that: 12 root 13 -60 - 0K 104K WAIT 0 744:58 82.50% intr And when I get into >95% intr cpu usage, packets on dummynet raise their = latency a lot, slowing down everything (pipe or queue). Queue sizes are ajusted according to pipe bandwidth, using a sort of = rule where queue in bytes is equal to pipe width divided by 8 or by 10. Thank you. -- Patrick Tracanelli FreeBSD Brasil LTDA. Tel.: (31) 3516-0800 316601@sip.freebsdbrasil.com.br http://www.freebsdbrasil.com.br "Long live Hanin Elias, Kim Deal!"