[Bloat] [aqm] [tsvwg] how much of a problem is buffer bloat today?

[Dave Taht]

On Fri, Mar 22, 2013 at 6:23 AM, Mikael Abrahamsson <swmike at swm.pp.se> wrote:
> On Fri, 22 Mar 2013, grenville armitage wrote:
>
>>
>>
>> On 03/22/2013 15:27, Mikael Abrahamsson wrote:
>>         [..]
>>>
>>> I am not aware of any such work going on, so I'd like to know if
>>> anyone else is aware of work in this area?
>>
>>
>> Of possible relevance, recent FreeBSDs have SIFTR -- a kernel resident
>> module for collecting TCP state-machine stats (like cwnd, rtt estimator,
>> etc) as packets arrive and depart.
>>
>> http://www.freebsd.org/cgi/man.cgi?query=siftr
>
>
> This seems exactly like what I'm after.
>
> On another note, is there software that can get mirrored traffic from
> another host and do TCP analysis of flows when it comes to buffer bloat,
> packet loss etc. If there was, I am in the position of running this against
> a large number of customers over time and can present the results.

http://web10g.org/ and ihttp://www.web100.org/ are also potentially
very useful. My concern with this used to be that it gets it's fingers
into the tcp hot path, but in practice modern gear is so fast it's
hard to notice.

I used to patch this into cerowrt but it was hard to keep the patches
in sync with the linux mainline code I was also tracking. Might
consider adding it again, but in the general case it seems more useful
on the end points than elsewhere (my use case was against the local
test suites on cero and on the polipo web proxy resident on the
router)

>
>
> --
> Mikael Abrahamsson    email: swmike at swm.pp.se
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-- 
Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html