Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030295AbVIVM72 (ORCPT ); Thu, 22 Sep 2005 08:59:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030299AbVIVM71 (ORCPT ); Thu, 22 Sep 2005 08:59:27 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:38631 "EHLO mx3.mail.elte.hu") by vger.kernel.org with ESMTP id S1030295AbVIVM70 (ORCPT ); Thu, 22 Sep 2005 08:59:26 -0400 Date: Thu, 22 Sep 2005 14:59:50 +0200 From: Ingo Molnar To: Thomas Gleixner Cc: Roman Zippel , linux-kernel@vger.kernel.org, akpm@osdl.org, george@mvista.com, johnstul@us.ibm.com, paulmck@us.ibm.com Subject: Re: [ANNOUNCE] ktimers subsystem Message-ID: <20050922125950.GA14822@elte.hu> References: <20050919184834.1.patchmail@tglx.tec.linutronix.de> <1127342485.24044.600.camel@tglx.tec.linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1127342485.24044.600.camel@tglx.tec.linutronix.de> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=AWL autolearn=disabled SpamAssassin version=3.0.3 0.0 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 961 Lines: 23 * Thomas Gleixner wrote: > > > This revealed a reasonable explanation for this behaviour. Both > > > networking and disk I/O arm a lot of timeout timers (the maximum number > > > of armed timers during the tests observed was ~400000). > > > > This triggers the obvious question: where are these timers coming from? > > You don't think that having that much timers in first place is little > > insane (especially if these are kernel timers)? > > Quick answer: Networking and disk I/O. Insane load on a 4 way SMP > machine. Check yourself. :) a busy network server can easily have millions of timers pending. I once had to increase a server's 16 million tw timer sysctl limit ... Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/