Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261719AbVDSWwX (ORCPT ); Tue, 19 Apr 2005 18:52:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261722AbVDSWwX (ORCPT ); Tue, 19 Apr 2005 18:52:23 -0400 Received: from pat.uio.no ([129.240.130.16]:51086 "EHLO pat.uio.no") by vger.kernel.org with ESMTP id S261719AbVDSWwT (ORCPT ); Tue, 19 Apr 2005 18:52:19 -0400 Subject: Re: bdflush/rpciod high CPU utilization, profile does not make sense From: Trond Myklebust To: Jakob Oestergaard Cc: Greg Banks , Linux Kernel Mailing List In-Reply-To: <20050419194515.GP17359@unthought.net> References: <1113083552.11982.17.camel@lade.trondhjem.org> <20050411074806.GX347@unthought.net> <1113222939.14281.17.camel@lade.trondhjem.org> <20050411134703.GC13369@unthought.net> <1113230125.9962.7.camel@lade.trondhjem.org> <20050411144127.GE13369@unthought.net> <1113232905.9962.15.camel@lade.trondhjem.org> <20050411154211.GG13369@unthought.net> <1113267809.1956.242.camel@hole.melbourne.sgi.com> <20050412092843.GB17359@unthought.net> <20050419194515.GP17359@unthought.net> Content-Type: text/plain Date: Tue, 19 Apr 2005 18:46:28 -0400 Message-Id: <1113950788.10685.9.camel@lade.trondhjem.org> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 Content-Transfer-Encoding: 7bit X-UiO-Spam-info: not spam, SpamAssassin (score=-3.523, required 12, autolearn=disabled, AWL 1.48, UIO_MAIL_IS_INTERNAL -5.00) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1013 Lines: 30 ty den 19.04.2005 Klokka 21:45 (+0200) skreiv Jakob Oestergaard: > It mounts a home directory from a 2.6.6 NFS server - the client and > server are on a hub'ed 100Mbit network. > > On the earlier 2.6 client I/O performance was as one would expect on > hub'ed 100Mbit - meaning, not exactly stellar, but you'd get around 4-5 > MB/sec and decent interactivity. OK, hold it right there... So, IIRC the problem was that you were seeing abominable retrans rates on UDP and TCP, and you are using a 100Mbit hub rather than a switch? What does the collision LED look like, when you see these performance problems? Also, does that hub support NICs that do autonegotiation? (I'll bet the answer is "no"). Cheers, Trond -- Trond Myklebust - 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/