Subway Poseidon USB to LAN adapter tests

[platon42]

> What really does surprise me, was the extreme slow transfer
> rates of these adapters. Both had a transferrate of about
4 to 5 kilobytes/sec .

No, that's not normal. Although I didn't test all new drivers on the old Highway and/or Subway cards, I wouldn't see why the driver should perform that bad. On the Algor, I had transfer rates of about 400KB/sec with MiamiDX.

[platon42]

> Any help would greatly be appreciated

Unfortunately, I didn't have the time to refit my subway/highway yet to do some tests.

The very low rate rather sounds to me as if packets get lost or are somehow delayed. Using a raw tcp monitor on both sides of the connection (e.g. MiamiTCPDump) could give some insight what happens there. Also, try ping to see if packets get lost, with varying ping packet sizes.

 

[platon42]

Today I had the time to do some testing (and in the progress fry my Subway USB :-( ).

Apparently, the later Asix-Chipsets have the ability to send multiple packets in one USB transfer (up to 2K of packets, hence: 1500+548 max) and the class did not cater for this. I have fixed this now, and the updated class is available on request until I release the next Poseidon update.