Re: Poor TCP throughput in 2.1.103

Eric Schenk (eschenk@pc-37249.bc.rogers.wave.ca)
Sun, 24 May 1998 10:25:48 -0600

Shaw Carruthers <shaw@shawc.demon.co.uk> writes:
>Yes I have the same problem with 2.0.33. The magic window size is 13140,
>up to this size I get no stalls.
>
>Here is what happens in 2.1.103 with the default window:- stalls of about
>20 secs.

Just to clarify here, am I correct in assuming that in this trace
you where sending data from the linux box 194.159.255.135 to some
other box at 158.152.146.90?

If so, then this sequence:

>14:13:23.399699 194.159.255.135.20 > 158.152.146.90.1046: . 62293:63753(1460)
>ack 1 win 8760 (DF) [tos 0x8]
>14:13:23.899699 158.152.146.90.1046 > 194.159.255.135.20: . ack 63753 win
>16060 (DF) [tos 0x8]
>/* stalls here */
>14:13:42.289699 194.159.255.135.20 > 158.152.146.90.1046: .
>63753:65213(1460) ack 1 win 8760 (DF) [tos 0x8]

Would seem to indicate a problem with our TCP code.
If the data was flowing the other way, then I cannot make a clear
deduction on where the problem was from this small data sample.

Cheers,

-- 
Eric Schenk                             www: http://www.loonie.net/~eschenk
                          email: eschenk@loonie.net, eschenk@rogers.wave.ca




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