From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 18 Oct 2002 01:32:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 18 Oct 2002 01:32:46 -0400 Received: from mons.uio.no ([129.240.130.14]:31653 "EHLO mons.uio.no") by vger.kernel.org with ESMTP id ; Fri, 18 Oct 2002 01:32:45 -0400 To: Hirokazu Takahashi Cc: habanero@us.ibm.com, neilb@cse.unsw.edu.au, davem@redhat.com, linux-kernel@vger.kernel.org, nfs@lists.sourceforge.net Subject: Re: [NFS] Re: [PATCH] zerocopy NFS for 2.5.36 References: <003301c275e1$0bf76810$2a060e09@beavis> <20021017.222602.48536782.taka@valinux.co.jp> <001301c275e6$f31d5970$2a060e09@beavis> <20021018.012618.74755132.taka@valinux.co.jp> From: Trond Myklebust Date: 18 Oct 2002 07:38:23 +0200 In-Reply-To: <20021018.012618.74755132.taka@valinux.co.jp> Message-ID: User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Common Lisp) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >>>>> " " == Hirokazu Takahashi writes: > Congestion avoidance mechanism of NFS clients might cause this > situation. I think the congestion window size is not enough > for high end machines. You can make the window be larger as a > test. The congestion avoidance window is supposed to adapt to the bandwidth that is available. Turn congestion avoidance off if you like, but my experience is that doing so tends to seriously degrade performance as the number of timeouts + resends skyrockets. Cheers, Trond