From owner-freebsd-ipfw@FreeBSD.ORG Fri Jan 22 13:38:06 2010 Return-Path: Delivered-To: freebsd-ipfw@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 957D3106568B for ; Fri, 22 Jan 2010 13:38:06 +0000 (UTC) (envelope-from luigi@onelab2.iet.unipi.it) Received: from onelab2.iet.unipi.it (onelab2.iet.unipi.it [131.114.59.238]) by mx1.freebsd.org (Postfix) with ESMTP id 573938FC17 for ; Fri, 22 Jan 2010 13:38:06 +0000 (UTC) Received: by onelab2.iet.unipi.it (Postfix, from userid 275) id 7AC84730A1; Fri, 22 Jan 2010 14:46:28 +0100 (CET) Date: Fri, 22 Jan 2010 14:46:28 +0100 From: Luigi Rizzo To: Evgenii Davidov Message-ID: <20100122134628.GA22078@onelab2.iet.unipi.it> References: <25ff90d60912180612y2b1f64fbw34b4d7f648762087@mail.gmail.com> <25ff90d61001021736p7b695197q104f4a7769b51b71@mail.gmail.com> <20100110185232.GA27907@onelab2.iet.unipi.it> <20100112110539.GQ10388@korolev-net.ru> <20100122131026.GC19815@korolev-net.ru> <20100122133905.GA21059@onelab2.iet.unipi.it> <20100122133535.GD19815@korolev-net.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100122133535.GD19815@korolev-net.ru> User-Agent: Mutt/1.4.2.3i Cc: freebsd-ipfw@freebsd.org Subject: Re: dummynet: waking up pipe 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: Fri, 22 Jan 2010 13:38:06 -0000 On Fri, Jan 22, 2010 at 04:35:35PM +0300, Evgenii Davidov wrote: ... > > > > my problem is that dummynet cpu usage jumps from 0 to 99%: > > > > > > > > 33 root 1 -68 - 0K 8K - 1 512.6H 86.18% dummynet > > > > 33 root 1 -68 - 0K 8K - 1 512.6H 85.89% dummynet > > > > 33 root 1 -68 - 0K 8K - 1 512.6H 88.28% dummynet > > > > 33 root 1 -68 - 0K 8K - 0 512.6H 78.17% dummynet > > > > 33 root 1 -68 - 0K 8K - 0 512.6H 0.88% dummynet > > > > 33 root 1 -68 - 0K 8K - 1 512.6H 0.10% dummynet > > > > 33 root 1 -68 - 0K 8K - 1 512.7H 0.00% dummynet > > > > 33 root 1 -68 - 0K 8K - 1 512.7H 0.10% dummynet > > > > i am not too clear on why this happens -- there shuold be only > > one instance of the dummynet thread, not 8 as in your case. > > no-no, one instance, it's a grep of a top log ok then it's rather normal -- the task wakes up every millisecond and it might have hundreds of packets to send at once, especially when the machine is heavily loaded as in your case.