Slow TCP connection between linux and wince

From: Pavel Machek (pavel@suse.cz)
Date: Thu Jun 01 2000 - 20:04:04 EST

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Hi!

I've two computers (PC and philips velo 1) connected using null-modem
cable at 115200. Unfortunately, connection speed is ~2.7K/sec (where
10K/sec should be possible). TCP dump looks like this:

02:59:02.875029 192.168.55.100.1029 > 10.0.0.3.www: . ack 232141 win 3100 (DF)
02:59:02.875097 10.0.0.3.www > 192.168.55.100.1029: . 233601:235061(1460) ack 196 win 16060 (DF)
02:59:03.235031 192.168.55.100.1029 > 10.0.0.3.www: . ack 233601 win 3100 (DF)
02:59:03.235094 10.0.0.3.www > 192.168.55.100.1029: . 235061:236521(1460) ack 196 win 16060 (DF)
02:59:03.775064 192.168.55.100.1029 > 10.0.0.3.www: . ack 235061 win 3100 (DF)
02:59:03.775137 10.0.0.3.www > 192.168.55.100.1029: . 236521:237981(1460) ack 196 win 16060 (DF)
02:59:04.145061 192.168.55.100.1029 > 10.0.0.3.www: . ack 236521 win 3100 (DF)
02:59:04.145131 10.0.0.3.www > 192.168.55.100.1029: . 237981:239441(1460) ack 196 win 16060 (DF)
02:59:04.605029 192.168.55.100.1029 > 10.0.0.3.www: . ack 237981 win 3100 (DF)
02:59:04.605095 10.0.0.3.www > 192.168.55.100.1029: . 239441:240901(1460) ack 196 win 16060 (DF)
02:59:05.065063 192.168.55.100.1029 > 10.0.0.3.www: . ack 239441 win 3100 (DF)
02:59:05.065126 10.0.0.3.www > 192.168.55.100.1029: . 240901:242361(1460) ack 196 win 16060 (DF)
02:59:05.445026 192.168.55.100.1029 > 10.0.0.3.www: . ack 240901 win 3100 (DF)
02:59:05.445089 10.0.0.3.www > 192.168.55.100.1029: . 242361:243821(1460) ack 196 win 16060 (DF)
02:59:05.795063 192.168.55.100.1029 > 10.0.0.3.www: . ack 242361 win 3100 (DF)
02:59:05.795125 10.0.0.3.www > 192.168.55.100.1029: . 243821:245281(1460) ack 196 win 16060 (DF)
02:59:06.325035 192.168.55.100.1029 > 10.0.0.3.www: . ack 243821 win 3100 (DF)
02:59:06.325100 10.0.0.3.www > 192.168.55.100.1029: . 245281:246741(1460) ack 196 win 16060 (DF)
02:59:06.695033 192.168.55.100.1029 > 10.0.0.3.www: . ack 245281 win 3100 (DF)
02:59:06.695099 10.0.0.3.www > 192.168.55.100.1029: . 246741:248201(1460) ack 196 win 16060 (DF)

Is there any way to speed connection up? "Cheat" breaking TCP rules is
completely ok: I'm trying to make linux work on velo 1, and waiting
10minutes before kernel is uploaded is a bit boring....

(Uhm, that ce box announces window of 3100. Is not it bit too litlle for 12Meg box? Could lowering mtu possibly help?)

Pavel

-- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents me at discuss@linmodems.org

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Next message: Pavel Machek: "Re: Loopback (dir->dir) mounting (NOT -o loop)"
Previous message: Martin Costabel: "Re: Wierd problem with mount, labels and 2.3.99-pre9+"
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Maybe reply: Andi Kleen: "Re: Slow TCP connection between linux and wince"
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