From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262911AbVDHSNd (ORCPT ); Fri, 8 Apr 2005 14:13:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262913AbVDHSNc (ORCPT ); Fri, 8 Apr 2005 14:13:32 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:60078 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S262911AbVDHSMv (ORCPT ); Fri, 8 Apr 2005 14:12:51 -0400 Subject: Re: ext3 allocate-with-reservation latencies From: Lee Revell To: cmm@us.ibm.com Cc: "Stephen C. Tweedie" , Ingo Molnar , linux-kernel , Andrew Morton In-Reply-To: <1112983801.10605.32.camel@dyn318043bld.beaverton.ibm.com> References: <1112673094.14322.10.camel@mindpipe> <20050405041359.GA17265@elte.hu> <1112765751.3874.14.camel@localhost.localdomain> <20050407081434.GA28008@elte.hu> <1112879303.2859.78.camel@sisko.sctweedie.blueyonder.co.uk> <1112917023.3787.75.camel@dyn318043bld.beaverton.ibm.com> <1112971236.1975.104.camel@sisko.sctweedie.blueyonder.co.uk> <1112983801.10605.32.camel@dyn318043bld.beaverton.ibm.com> Content-Type: text/plain Date: Fri, 08 Apr 2005 14:12:49 -0400 Message-Id: <1112983970.10565.0.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.2.1.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2005-04-08 at 11:10 -0700, Mingming Cao wrote: > However I am still worried that the rw lock will allow concurrent files > trying to lock the same window at the same time. Only one succeed > though., high cpu usage then. And also, in the normal case the > filesystem is not really full, probably rw lock becomes expensive. FWIW this was a 125GB filesystem, about 70% full. Lee