Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261153AbVCaH62 (ORCPT ); Thu, 31 Mar 2005 02:58:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261155AbVCaH5f (ORCPT ); Thu, 31 Mar 2005 02:57:35 -0500 Received: from mx1.elte.hu ([157.181.1.137]:10380 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S261163AbVCaHsu (ORCPT ); Thu, 31 Mar 2005 02:48:50 -0500 Date: Thu, 31 Mar 2005 09:48:33 +0200 From: Ingo Molnar To: Lee Revell Cc: Trond Myklebust , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: NFS client latencies Message-ID: <20050331074833.GA17803@elte.hu> References: <1112137487.5386.33.camel@mindpipe> <1112138283.11346.2.camel@lade.trondhjem.org> <1112192778.17365.2.camel@mindpipe> <1112194256.10634.35.camel@lade.trondhjem.org> <20050330115640.0bc38d01.akpm@osdl.org> <1112217299.10771.3.camel@lade.trondhjem.org> <1112236017.26732.4.camel@mindpipe> <20050331073921.GA17455@elte.hu> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="EeQfGwPcQSOJBaQU" Content-Disposition: inline In-Reply-To: <20050331073921.GA17455@elte.hu> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 18085 Lines: 269 --EeQfGwPcQSOJBaQU Content-Type: text/plain; charset=us-ascii Content-Disposition: inline * Ingo Molnar wrote: > could you check the -41-23 -RT kernel at the usual place: > > http://redhat.com/~mingo/realtime-preempt/ > > i've added Trond's radix lookup code, plus the lockbreaker patch. > > (one thing that is not covered yet is nfs_scan_list() - that still scans > a list. Trond, is that fixable too?) ok, find a new latency trace attached (1.6 msecs). I generated write loads, and the nfs_scan_list_dirty() latency is gone and indeed nfs_scan_list() generates the worst latency - while processing 8535 pages in one critical section. 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