DragonFly kernel List (threaded) for 2005-07
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Re: net.inet.tcp.inflight_enable
:> Try increasing net.inet.tcp.inflight_stab from 20 to 40 and
:> see if that fixes ethe congestion window expansion problem. I'm
:> not sure why the congestion window isn't expanding.
:
:I tried it and put the results at the following page.
:
: http://www.demizu.org/~noritosi/memo/2005/0711/
:
:I compared the throughput of BDP Limiting with the throughput of
:congestion avoidance in my environment. In my environment, I saw
:that, if inflight_stab is lower than 50, the throughput of BDP
:Limiting is lower than that of congestion avoidance, because
:congestion window with BDP Limiting grows slower than that in
:congestion avoidance.
:
:As you know, in the congestion avoidance phase, congestion window is
:increased one MSS per RTT. With BDP Limiting, congestion window is
:increased one MSS per several RTTs in my environment.
:
:Regards,
:Noritoshi Demizu
It's still not operating quite as I would expect. Could you compare
the results for a very long transfer, like 100 MBytes ? If those numbers
are closer then it may well be that all I really need to do is give it
a better initial bandwidth estimate.
-Matt
Matthew Dillon
<dillon@xxxxxxxxxxxxx>
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