From mboxrd@z Thu Jan 1 00:00:00 1970 From: TB Subject: Re: Divide error in bictcp_cong_avoid ? Date: Wed, 04 May 2011 15:03:13 -0400 Message-ID: <4DC1A2F1.80507@techboom.com> References: <4DC178D3.6030308@techboom.com> <20110504104940.cd0d9e9a.rdunlap@xenotime.net> <20110504113351.4643a0c9@nehalam> <20110504113521.3c506a54.rdunlap@xenotime.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Stephen Hemminger , netdev , linux-kernel@vger.kernel.org To: Randy Dunlap Return-path: In-Reply-To: <20110504113521.3c506a54.rdunlap@xenotime.net> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On 11-05-04 02:35 PM, Randy Dunlap wrote: > On Wed, 4 May 2011 11:33:51 -0700 Stephen Hemminger wrote: > >> On Wed, 4 May 2011 10:49:40 -0700 >> Randy Dunlap wrote: >> >>> [add cc to netdev] >>> >>> >>> On Wed, 04 May 2011 12:03:31 -0400 TB wrote: >>> >>>> We're having this issue sporadically on a few servers and this is the >>>> backtrace we get from netconsole. >>>> >>>> >>>> [28522.642419] divide error: 0000 [#1] SMP >>>> [28522.642457] last sysfs file: >>>> /sys/devices/pci0000:00/0000:00:1f.2/host2/target2:0:0/2:0:0:0/vendor >>>> [28522.642504] CPU 0 >>>> [28522.642511] Modules linked in: >>>> i2c_i801 >>>> i2c_core >>>> evdev >>>> button >>>> [28522.642570] >>>> [28522.642590] Pid: 0, comm: swapper Not tainted 2.6.38.5 #6<<<<<<<<<<<<<< >>>> >>>> Supermicro X8DTH-i/6/iF/6F >>>> / >>>> X8DTH >>>> >> >> What kernel version? I suspect they are running something really old >> kernel like RHEL 5 since BIC has not been the default congestion control for >> several years. > > Please see about 6 lines above.... at the "<<<<<<<<<<<". /proc/sys/net/ipv4/tcp_available_congestion_control cubic reno cat /proc/sys/net/ipv4/tcp_congestion_control cubic