On Sat, Jan 19, 2002 at 09:06:11PM +1100, Howard Lowndes wrote: > D Dynalink (I think) connected to a Celeron 733/128Mb
I've got a dynalink 56K dialup. > D 220msec I get the same result with factory defaults. > D 450msec +230msec Seems unreasonable. I don't have an answer as to why its so much bigger. (But I could make one up if you like) There's a few thing you can do to improve delays. Compressing data adds delays, and since encrypted data doesn't compress well you may as well turn it off (AT%C0), also try turning buffering off (AT\N0). (If data is being buffered, then it isn't being sent straight away) I've just done that (my modem init string is ATS2=255%C0\N1) Now my pings average 160msec, they get down as low as 140msec. But since I turned both buffering and compression off at the same time, I don't know if both are helping. > Similar tests for ADSL (Celeron 850/128Mb) to ADSL sites show around > 55msec for the type 17 packets with about 15msec additional for the type > 50 packets for the tunnelling component despite the fact that the targets > vary between P166/48Mb, Celeron 500/128Mb and Celeron 850/256Mb. I would expect a dialup modem to have bigger round trip delays than asdl. > Agreed that packet sizes will be different with type 50 being bigger, but > is it that much material? To make the comparison fairer, you should tcpdump the ppp interface while pinging through the tunnel to get the size of the ping with overhead. Then use that size to ping outside the tunnel. -- SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
