From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jarek Poplawski Subject: Re: pppd soft lockups under load Date: Fri, 7 Mar 2008 10:13:09 +0000 Message-ID: <20080307101309.GB4203@ff.dom.local> References: <47D05778.6090006@samoylyk.sumy.ua> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org To: Oleksandr Samoylyk Return-path: Received: from fg-out-1718.google.com ([72.14.220.156]:47759 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750861AbYCGKLt (ORCPT ); Fri, 7 Mar 2008 05:11:49 -0500 Received: by fg-out-1718.google.com with SMTP id e21so461924fga.17 for ; Fri, 07 Mar 2008 02:11:48 -0800 (PST) Content-Disposition: inline In-Reply-To: <47D05778.6090006@samoylyk.sumy.ua> Sender: netdev-owner@vger.kernel.org List-ID: On 06-03-2008 21:43, Oleksandr Samoylyk wrote: > Dear community, > > I'm running a busy pptp-server which serves about 1500 users on about 80 > Mbit/s (> 15000 packets/sec). I use poptop, traffic shaper and basic > firewall rules. > > As for hardware it's a server on SuperMicro Server on X7DB8+ serverboard > server with 8 GB RAM on it running Ubuntu Server Edition. > > As for problem, sometimes I get the following erors in logs: > [ 0.000000] BUG: soft lockup - CPU#3 stuck for 11s! [pppd:65437] ... > root@vpn:~# cat /proc/interrupts > CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 > CPU6 CPU7 ... > 2296: 76853 76976 76639 76692 248073 247957 > 248079 248084 PCI-MSI-edge eth1 > 2297: 266795 266672 267009 266956 93920 94035 > 93914 93908 PCI-MSI-edge eth0 Hi, Maybe it doesn't matter here but I think you should rethink this irq balancing for eths. Here is something interesting: http://marc.info/?l=linux-netdev&m=120349568512423&w=2 Regards, Jarek P.