*- On 20 Aug, Brian Servis wrote about "uploads over modem are SLOOOOOW!" > Hi all, > > I connect via dial-up with a usual connect of 50666/ARQ/V90/LAPM/V42BIS. > When I send a large email with attachments or upload a file it is VERY > SLOW. Watching the traffic on something like pppload or wmppp show > only short bursts of intermintent traffic, often there is a 5-7 second > pause between the upload bursts. I don't have any problems with > dowloads. I don't set mtu or mru in the ppp config files, after the > link is up ifconfig shows that mtu is set at 1500. My latest upload > test via ftp gave '725473 bytes sent in 1187.13 secs (0.6 kB/s)' and a > download test gave '725473 bytes received in 133.82 secs (5.3 kB/s)'. > That's a factor of 8.87 speed difference between download and upload! > > Do I have to live with this or do I have something configured wrong. > I am running kernel 2.2.11 and ppp 2.3.7-3. > > Thanks for any pointers, >
Thanks to all how have sent replies. I have set the mtu and mru values to 552 and that has raised the upload speed test of the above example to 2.2 kB/s. I also tried testing a 2.0.37 kernel and that did not produce any different results. With ppp debug turned on I notice that at the start of a pause the ppp.log shows a reset signal. For the above file the with mtu of 552 there were a total of 25 resets like the following. Aug 23 10:47:12 brian pppd[1484]: rcvd [CCP ResetReq id=0x25] Aug 23 10:47:12 brian pppd[1484]: sent [CCP ResetAck id=0x25] The modem is an internal ISA USR Sporster, so it is not the greatest modem. I have no idea what type of modem is on the other end of the connection and I don't have access to other modems. So it looks like I will have to live with 2.2 kB/s uploads. Thanks, -- Brian --------------------------------------------------------------------- Mechanical Engineering [EMAIL PROTECTED] Purdue University http://www.ecn.purdue.edu/~servis ---------------------------------------------------------------------
