[Bloat] came across an unexpected side-effect of bufferbloat

Dave Taht dave.taht at gmail.com
Mon Aug 3 10:55:12 EDT 2015

This is precisely the sort of failures I (perversely) hope to induce
at battlemesh, using flent to drive the network to saturation.

On Mon, Aug 3, 2015 at 7:00 AM, Steinar H. Gunderson
<sgunderson at bigfoot.com> wrote:
> On Mon, Aug 03, 2015 at 11:53:40PM +1000, jb wrote:
>> While researching a little I came across a message on the Amazon support
>> forums that said after 3 hours of uploading to Amazon, their cable modem
>> would crash and reboot. The reason was that the SNMP the cable modem needed
>> to stay healthy was timing out (due to the excessive latency induced by the
>> continuous uploading). The author didn't know it was bufferbloat, of course.
> FWIW, you don't need bufferbloat for this to fail. A classic thing with
> switches (typically underbuffered rather than overbuffered!) is that when you
> run the links full, the OSPF packets get dropped and eventually your link
> flaps because the other side thinks you're down.
> This is one of the reasons why most L3 switches (well, anything that's
> advanced enough to do OSPF or the likes in the first place :-) ) have QoS at
> all: You need to protect your administrative traffic.
> /* Steinar */
> --
> Homepage: http://www.sesse.net/
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Dave Täht
worldwide bufferbloat report:
What will it take to vastly improve wifi for everyone?

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