From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752393AbZBDArz (ORCPT ); Tue, 3 Feb 2009 19:47:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754260AbZBDAri (ORCPT ); Tue, 3 Feb 2009 19:47:38 -0500 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:32817 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754092AbZBDArh (ORCPT ); Tue, 3 Feb 2009 19:47:37 -0500 Date: Tue, 03 Feb 2009 16:47:34 -0800 (PST) Message-Id: <20090203.164734.76871204.davem@davemloft.net> To: w@1wt.eu Cc: zbr@ioremap.net, herbert@gondor.apana.org.au, jarkao2@gmail.com, dada1@cosmosbay.com, ben@zeus.com, mingo@elte.hu, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, jens.axboe@oracle.com Subject: Re: [PATCH v2] tcp: splice as many packets as possible at once From: David Miller In-Reply-To: <20090203122535.GB8633@1wt.eu> References: <20090203121209.GA9154@gondor.apana.org.au> <20090203121836.GA23300@ioremap.net> <20090203122535.GB8633@1wt.eu> X-Mailer: Mew version 6.1 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Willy Tarreau Date: Tue, 3 Feb 2009 13:25:35 +0100 > Well, FWIW, I've always observed better performance with 4k MTU (4080 to > be precise) than with 9K, and I think that the overhead of allocating 3 > contiguous pages is a major reason for this. With what hardware? If it's with myri10ge, that driver uses page frags so would not be using 3 contiguous pages even for jumbo frames.