From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757809AbXIROZW (ORCPT ); Tue, 18 Sep 2007 10:25:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755677AbXIROZF (ORCPT ); Tue, 18 Sep 2007 10:25:05 -0400 Received: from mail.tmr.com ([64.65.253.246]:51474 "EHLO gaimboi.tmr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755055AbXIROZD (ORCPT ); Tue, 18 Sep 2007 10:25:03 -0400 Message-ID: <46EFE09B.6090901@tmr.com> Date: Tue, 18 Sep 2007 10:28:43 -0400 From: Bill Davidsen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.8) Gecko/20061105 SeaMonkey/1.0.6 MIME-Version: 1.0 To: lnx-kern@soo.com CC: Kernel Mailing list Subject: Re: PROBLEM: Network sky2 Module References: <46E2BC6A.4070800@gmx.de> <46EF4DE1.4000707@soo.com> In-Reply-To: <46EF4DE1.4000707@soo.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org ben soo wrote: > i'm experiencing this problem myself. i have 2 servers, one using > X86_64 kernel version 2.6.23-rc5 on a 100Mbit network and one with i386 > kernel version 2.6.23-rc6 on a 1Gbit network. > > They both have this issue with the sky2 network device driver whereby > the device would stop working and need to be brought down and back up. > > On the X86_64 kernel on a 100Mbit network, this is a very occasional > thing, while on the i386 kernel on a 1Gbit network the device only works > for a few minutes at a time. If i set the MTU to 7200 then the device > seems to stay functional, but then i see long delays when it's talking > to 100Mbit devices with standard 1500 MTU that are outside of its LAN > segment. > > This last might be an artifact caused by the firewall, i dunno. > Yes, I have found that I get far less problem in this area leaving the MTU at 1500, then putting a larger MTU (usually 9000) into the routing table for segments, or even just machines, where I know there is direct connectivity. I use 9000 MTU with my directly connected file server, 1500 elsewhere. I can go to 9000 for nbd servers as well, assuming the connection doesn't pass a firewall. I have some hints that while the switches I use will speak 10/100/1000 between machines with different speeds, and will handle jumbo packets between machines at the same speed, if I'm going Gbit/jumbo to 1500/slower performance seems to suffer more than talking smaller packets. That may be because window size needs to be even larger or something. I have some legacy machines talking 10Mbit/half on 10base2 cable, I may be seeing more of this than the average site. That's legacy as in "attached to something expensive to replace." -- Bill Davidsen "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot