Messages in this thread | | | Date | Mon, 3 Feb 2003 17:19:10 +0100 | From | bert hubert <> | Subject | Re: problems achieving decent throughput with latency. |
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On Mon, Feb 03, 2003 at 04:11:46PM +0000, John Bradford wrote: > > > TCP can only send into a pipe as fast as it can see the > > > ACKs coming back. That is how TCP clocks its sending rate, > > > and latency thus affects that. > > > > Wouldn't you just need larger windows? The problem is latency, not > > bandwidth. > > Exactly - the original post says that no problems are experienced > using UDP, which backs that up.
My TCP may be getting hazy but with latency, TCP may limit the amount of packets 'in flight'. I think this is called the 'cwnd', congestion window. I also seem to recall that this window is limited to the actually negotiated TCP window size.
But here I leave this discussion as I've swapped out the finer details of congestion windows to the Stevens books which other's have probably read more recently than I did.
Regards,
bert
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