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From
SubjectRe: Poor TCP throughput in 2.1.103
On Sun, 24 May 1998 ak@muc.de wrote:

>
> Slow start should detect that. If it doesn't something is fishy in 2.1
> TCP. Do you have the same problem with 2.0 too?
>

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.

14:13:17.829699 158.152.146.90.1046 > 194.159.255.135.20: . ack 60833 win
16060 (DF) [tos 0x8]
14:13:17.839699 194.159.255.135.20 > 158.152.146.90.1046: .
60833:62293(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:18.339699 158.152.146.90.1046 > 194.159.255.135.20: . ack 62293 win
16060 (DF) [tos 0x8]
14:13:18.359699 194.159.255.135.20 > 158.152.146.90.1046: .
62293:63753(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:18.469699 194.159.255.135.20 > 158.152.146.90.1046: P
63753:64077(324) ack 1 win 8760 (DF) [tos 0x8]
14:13:18.989699 194.159.255.135.20 > 158.152.146.90.1046: .
64077:65537(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:19.509699 194.159.255.135.20 > 158.152.146.90.1046: .
65537:66997(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:20.019699 194.159.255.135.20 > 158.152.146.90.1046: .
66997:68457(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:20.529699 194.159.255.135.20 > 158.152.146.90.1046: .
68457:69917(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:21.039699 194.159.255.135.20 > 158.152.146.90.1046: .
69917:71377(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:21.559699 194.159.255.135.20 > 158.152.146.90.1046: .
71377:72837(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:22.079699 194.159.255.135.20 > 158.152.146.90.1046: .
72837:74297(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:22.579699 194.159.255.135.20 > 158.152.146.90.1046: .
74297:75757(1460) ack 1 win 8760 (DF) [tos 0x8]
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]
14:13:42.799699 158.152.146.90.1046 > 194.159.255.135.20: . ack 65213 win
16060 (DF) [tos 0x8]
14:13:43.459699 194.159.255.135.20 > 158.152.146.90.1046: .
65213:66673(1460) ack 1 win 8760 (DF) [tos 0x8]
14:13:43.969699 158.152.146.90.1046 > 194.159.255.135.20: . ack 66673 win
16060 (DF) [tos 0x8]

--
Shaw Carruthers - shaw@shawc.demon.co.uk
London SW14 7JW UK
This is not a sig( with homage to Magritte).




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