Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751323AbVJQNjT (ORCPT ); Mon, 17 Oct 2005 09:39:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751325AbVJQNjT (ORCPT ); Mon, 17 Oct 2005 09:39:19 -0400 Received: from e32.co.us.ibm.com ([32.97.110.150]:20921 "EHLO e32.co.us.ibm.com") by vger.kernel.org with ESMTP id S1751323AbVJQNjS (ORCPT ); Mon, 17 Oct 2005 09:39:18 -0400 Date: Mon, 17 Oct 2005 19:03:14 +0530 From: Dipankar Sarma To: Eric Dumazet Cc: Jean Delvare , torvalds@osdl.org, Serge Belyshev , LKML , Andrew Morton , Manfred Spraul Subject: Re: [RCU problem] was VFS: file-max limit 50044 reached Message-ID: <20051017133314.GA20784@in.ibm.com> Reply-To: dipankar@in.ibm.com References: <20051017084609.GA6257@in.ibm.com> <43536A6C.102@cosmosbay.com> <20051017103244.GB6257@in.ibm.com> <435394A1.7000109@cosmosbay.com> <20051017123655.GD6257@in.ibm.com> <4353A6F6.9050205@cosmosbay.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4353A6F6.9050205@cosmosbay.com> User-Agent: Mutt/1.5.10i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1219 Lines: 34 On Mon, Oct 17, 2005 at 03:28:22PM +0200, Eric Dumazet wrote: > Dipankar Sarma a ?crit : > >On Mon, Oct 17, 2005 at 02:10:09PM +0200, Eric Dumazet wrote: > > > > > >Can you try it with rcupdate.maxbatch set to 10000 in boot > >command line ? > > > > Changing maxbatch from 10 to 10000 cures the problem. > Maybe we could initialize maxbatch to (10000000/HZ), considering no current > cpu is able to queue more than 10.000.000 items per second in a list. I don't know, maybe I can look at a more adaptive heuristics. > > > >FWIW, the open/close test problem goes away if I set maxbatch to > >10000. I had introduced this limit some time ago to curtail > >the effect long running softirq handlers have on scheduling > >latencies, which now conflicts with OOM avoidance requirements. > > Yes, and probably OOM avoidance has a higher priority than latencies in DOS > situations... Yes, one would think. But the audio guys would chew my head for this :) Thanks Dipankar - 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/