From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Tvrtko A. Ursulin" Subject: Bonding gigabit and fast? Date: Tue, 16 Dec 2008 19:39:29 +0000 Message-ID: <200812161939.30033.tvrtko@ursulin.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from mk-outboundfilter-5-a-2.mail.uk.tiscali.com ([212.74.114.4]:47029 "EHLO mk-outboundfilter-5-a-2.mail.uk.tiscali.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756731AbYLPTje (ORCPT ); Tue, 16 Dec 2008 14:39:34 -0500 Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: Hi to all, Does it make any sense from bandwith point of view to bond gigabit and fast ethernet? I wanted to use adaptive-alb mode to load balance both transmit and receive direction of traffic but it seems 8139too does not support it so I use balance-rr. When serving data from the machine I get 13.7 MB/s aggregated while with a single slave (so bond still active) I get 5.6 MB/s for gigabit and 9.1 MB/s for fast. Yes, that's not a typo - fast ethernet is faster than gigabit. That is actually another problem I was trying to get to the bottom of for some time. Gigabit adapter is skge in a PCI slot and outgoing bandwith oscillates a lot during transfer, much more than on 8139too which is both stable and faster. Unfortunately this machine takes low-profile cards and so far I was unable to find something other than skge to test with. Oh and yes, kernel is 2.6.27(-9-generic, so Ubuntu derivative of 2.6.27). Tvrtko