Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932302AbWAQSMP (ORCPT ); Tue, 17 Jan 2006 13:12:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932303AbWAQSMP (ORCPT ); Tue, 17 Jan 2006 13:12:15 -0500 Received: from [81.2.110.250] ([81.2.110.250]:31140 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S932302AbWAQSMM convert rfc822-to-8bit (ORCPT ); Tue, 17 Jan 2006 13:12:12 -0500 Subject: Re: Kernel 2.6.15.1 + NFS is 4 times slower than FTP!? From: Alan Cox To: Tomasz =?iso-8859-2?Q?K=B3oczko?= Cc: Justin Piszcz , Phil Oester , linux-kernel@vger.kernel.org, apiszcz@lucidpixels.com In-Reply-To: References: <20060117012319.GA22161@linuxace.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Date: Tue, 17 Jan 2006 18:11:23 +0000 Message-Id: <1137521483.14135.59.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 750 Lines: 18 On Maw, 2006-01-17 at 18:48 +0100, Tomasz Kłoczko wrote: > > I wonder how much faster NFS over TCP would be, or if NFS in the kernel is > > the problem itself? > > On Linux NFS over TCP is slower than over UDP ~10%. For the specific case you measured. Its never quite that simple because behaviour over different networks and error patterns varies a lot and TCP can be a big win on loaded networks or under error conditions, especially packet loss, where fragmentation losses kill throughput on UDP. - 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/