I have put up screenshots of tcptrace -G and xplot.org's analysis of my most recent capture of an ipv6 connection over freebox (wired) from a debloat-testing kernel here in france (pre 3.1 by a lot) to a 2.6.16 kernel (the aformentioned netsonar box) in redwood city, ca, both running tcp cubic, over ipv6.
at first glance, it looked a lot like a classic bufferbloat trace, with complete with periodic collapses and cubic increasing the window. Then I noticed the sacks. I also have a trace taken between the debloat-testing box and a cerowrt box (running linux 3.04), both running westwood, which shows considerably less undesirable behavior, and I will repeat that test with cubic this evening and post additional data tomorrow morning. -- Dave Täht
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