We are seeing a peculiar problem in which downloading via the ppp
connection is perfect, but uploading is extremely slow. The set-up is an
ordinary 56K modem to an ISP. ASYNCMAP is zero, hardware flow control
has been checked (software flow control has also been tried) and the
serial card is a newer one. ifconfig ppp0 reports very few packets
dropped. This problem is consistent across several ISPs.
The one thing that did seem to speed it up significantly (though not to
full link capacity) was changing the port speed from 115200 to 57600. My
understanding is that it is good to drive the port speed a fair bit
higher than the modem connect speed so as to allow modem
compression/decompression for compressible files (which is quite often
the sort we have - large base64-encoded e-mail attachments).
Does anybody have any experience with this or can point me in the right
direction?
Thanks!
jk
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