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Re: Raise initial congestion window size / speedup slow start?

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From: Ed W
Subject: Re: Raise initial congestion window size / speedup slow start?
Date: Wednesday, July 14, 2010 - 4:01 pm

> Do you cite "An Argument for Increasing TCP's Initial Congestion Window"?

Well, I personally would shoot for starting from the position of 
assuming better than zero knowledge about our link and incorporating 
that into the initial cwnd estimate...

We know something about the RTT from the syn/ack times, speed of the 
local link and quickly we will learn about median window sizes to other 
destinations, plus additionally the kernel has some knowledge of other 
connections currently in progress.  With all that information perhaps we 
can make a more informed option than just a hard coded magic number? (Oh 
and lets make the option pluggable so that we can soon have 10 different 
kernel options...)

Seems like there is evidence that networks are starting to cluster into groups that would benefit from a range of cwnd options (higher/lower) - perhaps there is some way to choose a reasonable heuristic to cluster these and choose a better starting option?

Cheers

Ed W


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Messages in current thread:
Raise initial congestion window size / speedup slow start?, Ed W, (Wed Jul 14, 3:43 am)
Re: Raise initial congestion window size / speedup slow start?, Alan Cox, (Wed Jul 14, 4:58 am)
Re: Raise initial congestion window size / speedup slow start?, Bill Davidsen, (Wed Jul 14, 8:21 am)
Re: Raise initial congestion window size / speedup slow start?, David Miller, (Wed Jul 14, 11:15 am)
Re: Raise initial congestion window size / speedup slow start?, Ed W, (Wed Jul 14, 11:32 am)
Re: Raise initial congestion window size / speedup slow start?, Ed W, (Wed Jul 14, 11:48 am)
Re: Raise initial congestion window size / speedup slow start?, Stephen Hemminger, (Wed Jul 14, 12:10 pm)
Re: Raise initial congestion window size / speedup slow start?, Rick Jones, (Wed Jul 14, 1:17 pm)
Re: Raise initial congestion window size / speedup slow start?, Mitchell Erblich, (Wed Jul 14, 2:47 pm)
Re: Raise initial congestion window size / speedup slow start?, David Miller, (Wed Jul 14, 2:55 pm)
Re: Raise initial congestion window size / speedup slow start?, Ed W, (Wed Jul 14, 3:05 pm)
Re: Raise initial congestion window size / speedup slow start?, Hagen Paul Pfeifer, (Wed Jul 14, 3:13 pm)
Re: Raise initial congestion window size / speedup slow start?, Rick Jones, (Wed Jul 14, 3:19 pm)
Re: Raise initial congestion window size / speedup slow start?, Hagen Paul Pfeifer, (Wed Jul 14, 3:36 pm)
Re: Raise initial congestion window size / speedup slow start?, Hagen Paul Pfeifer, (Wed Jul 14, 3:40 pm)
Re: Raise initial congestion window size / speedup slow start?, Ed W, (Wed Jul 14, 3:52 pm)
Re: Raise initial congestion window size / speedup slow start?, Hagen Paul Pfeifer, (Wed Jul 14, 4:01 pm)
Re: Raise initial congestion window size / speedup slow start?, Ed W, (Wed Jul 14, 4:01 pm)
Re: Raise initial congestion window size / speedup slow start?, Ed W, (Wed Jul 14, 4:05 pm)
Re: Raise initial congestion window size / speedup slow start?, Bill Fink, (Wed Jul 14, 7:52 pm)
Re: Raise initial congestion window size / speedup slow start?, Bill Fink, (Wed Jul 14, 8:49 pm)
Re: Raise initial congestion window size / speedup slow start?, Tom Herbert, (Wed Jul 14, 9:12 pm)
Re: Raise initial congestion window size / speedup slow start?, H.K. Jerry Chu, (Wed Jul 14, 9:51 pm)
Re: Raise initial congestion window size / speedup slow start?, H.K. Jerry Chu, (Wed Jul 14, 10:09 pm)
Re: Raise initial congestion window size / speedup slow start?, H.K. Jerry Chu, (Wed Jul 14, 10:29 pm)
Re: Raise initial congestion window size / speedup slow start?, Ed W, (Thu Jul 15, 12:48 am)
Re: Raise initial congestion window size / speedup slow start?, Alan Cox, (Thu Jul 15, 3:33 am)
Re: Raise initial congestion window size / speedup slow start?, Bill Davidsen, (Thu Jul 15, 8:10 am)
Re: Raise initial congestion window size / speedup slow start?, Jerry Chu, (Thu Jul 15, 10:36 am)
Re: Raise initial congestion window size / speedup slow start?, Rick Jones, (Thu Jul 15, 12:51 pm)
Re: Raise initial congestion window size / speedup slow start?, Stephen Hemminger, (Thu Jul 15, 1:48 pm)
Re: Raise initial congestion window size / speedup slow start?, Bill Davidsen, (Thu Jul 15, 4:14 pm)
Re: Raise initial congestion window size / speedup slow start?, H.K. Jerry Chu, (Thu Jul 15, 5:23 pm)
Re: Raise initial congestion window size / speedup slow start?, Henrique de Moraes H ..., (Thu Jul 15, 7:58 pm)
Re: Raise initial congestion window size / speedup slow s ..., Hagen Paul Pfeifer, (Fri Jul 16, 2:03 am)
Re: Raise initial congestion window size / speedup slow start?, Patrick McManus, (Fri Jul 16, 10:01 am)
Re: Raise initial congestion window size / speedup slow start?, Ed W, (Fri Jul 16, 10:41 am)
Re: Raise initial congestion window size / speedup slow start?, H.K. Jerry Chu, (Fri Jul 16, 5:36 pm)
Re: Raise initial congestion window size / speedup slow start?, H.K. Jerry Chu, (Fri Jul 16, 6:23 pm)
Re: Raise initial congestion window size / speedup slow start?, Rick Jones, (Mon Jul 19, 10:08 am)
Re: Raise initial congestion window size / speedup slow start?, H.K. Jerry Chu, (Mon Jul 19, 3:51 pm)
Re: Raise initial congestion window size / speedup slow start?, Hagen Paul Pfeifer, (Mon Jul 19, 4:42 pm)