Pavel Machek <pavel@suse.cz> writes:
> 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)
The WinCE machine does not seem to implement delayed acks. Without that
good performance is very hard.
> 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?)
Maybe. How does the connection setup look like ?
-Andi
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This archive was generated by hypermail 2b29 : Wed Jun 07 2000 - 21:00:14 EST