On Fri, Mar 22, 2013 at 6:23 AM, Mikael Abrahamsson <[email protected]> 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: [email protected] > _______________________________________________ > aqm mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/aqm -- Dave Täht Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
