netdev - Re: Divide error in bictcp_cong

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Date:	Wed, 04 May 2011 15:03:13 -0400
From:	TB <lkml@...hboom.com>
To:	Randy Dunlap <rdunlap@...otime.net>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: Divide error in bictcp_cong_avoid ?

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<rdunlap@...otime.net>  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

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