From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759551AbYDBUJc (ORCPT ); Wed, 2 Apr 2008 16:09:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758812AbYDBUJZ (ORCPT ); Wed, 2 Apr 2008 16:09:25 -0400 Received: from nf-out-0910.google.com ([64.233.182.188]:18322 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758450AbYDBUJX convert rfc822-to-8bit (ORCPT ); Wed, 2 Apr 2008 16:09:23 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=Tyv7x3nYs0C8pN7R0PPmskt+nkzLFKSQKDGbhXggld5MuIAifwaxQQVkDvwW4nZtdH973GwRyE/JQpxf4fGFvwLtLWUImuTCG0HylOcgtJbcJmitjUogNFxVIj91pwP/nRACgBwKm1E+W8E/xBJEi+eRm8uzCFOieTl8+llovPo= Message-ID: <5a4c581d0804021309y6b0f3af1tab24090a17104bf4@mail.gmail.com> Date: Wed, 2 Apr 2008 22:09:20 +0200 From: "Alessandro Suardi" To: "=?ISO-8859-1?Q?Ilpo_J=E4rvinen?=" Subject: Re: 2.6.25-rc6-git2: warn_on_slowpath for tcp_simple_retransmit Cc: "Linux Kernel" , Netdev In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Content-Disposition: inline References: <5a4c581d0804011528g786550c5sfd6bf90c0c37706@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 2, 2008 at 10:10 AM, Ilpo Järvinen wrote: > On Wed, 2 Apr 2008, Alessandro Suardi wrote: > > > Found this in my FC6-based bittorrent box (K7-800 running > > a 2.6.25-rc6-git2 kernel) this evening. > > > > The kernel was upgraded two weeks ago to fix the bug > > in which an USB VIA driver hammered the PCI bus > > causing ATA disk performance to drop, and has been > > running since then (it still is). > > > > So it's actually 2.6.25-rc6-git2 plus patch as in here > > http://www.gossamer-threads.com/lists/linux/kernel/895506#895506 > > > > If there's anything useful I can do, just ask. Thanks ! > > Can you reproduce? Nope. That only happened once in this uptime: [root@donkey ~]# uptime 21:57:21 up 14 days, 22:04, 5 users, load average: 0.64, 0.47, 0.44 The machine runs unattended as a bittorrent client, 24x7, with a very low traffic (uploading at a steady ~36KB/s, and downloads happen in peaks). I VNC into it in the evening and manage the torrents; that is all. Now, there's an interesting tidbit: [root@donkey ~]# ip -s link show eth0 3: eth0: mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:c0:49:a7:33:fe brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped overrun mcast 959044156 60549131 0 0 0 0 TX: bytes packets errors dropped carrier collsns 744533957 66149681 0 0 0 0 [root@donkey ~]# ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:C0:49:A7:33:FE inet addr:192.168.1.7 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::2c0:49ff:fea7:33fe/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:60551468 errors:0 dropped:0 overruns:0 frame:0 TX packets:66152721 errors:0 dropped:0 overruns:1 carrier:0 collisions:0 txqueuelen:1000 RX bytes:959199592 (914.7 MiB) TX bytes:748395356 (713.7 MiB) Interrupt:12 Base address:0xce00 Somehow the "overruns" counter is seen differently by 'ip' and 'ifconfig' - one says 0, the other says 1 - perhaps the packet that WARN'd me on tcp_simple_retransmit ? If there's anything else - reproducing seems really really unlikely - 1 packet in 66 million... Thanks, --alessandro "Hold back the years, hold back the hours I want to live to see the sun break through these days" (Patrick Wolf, 'This Weather')