Hi all modem experimentators,
On Sun, 17 Dec 2000 10:35:59 +0100, Joerg Dietze wrote:
> Hi Christof and all,
> what is the speed of Your com port? Some time ago I figured out that A.
> loads smoother when speed of com port is set to lower value than modem
> connection. When my com1 was set to 115kbps there were many stallings
> while d/ling files which were totally gone with 38400.
> Regards Joerg
that's also my observation. With a 486/100 Mhz, UART16550 and 56K-Modem
the best throughput (for me) is with COM-Speed 28800 and Modem line
speed 33600.
If setting Modem line speed to 56k, with my telephon line, I get
a maximum of 44k.
On a PIII/450Mhz I've got the same result. Setting COM-Speed above 28800,
on both machines, I get a lot of errors in Arachne's TCP/IP-Statistic which
will slowdown any download.
I think the (packetdriver) epppd.exe and/or the COMx-part in core.exe
can't handle such speed.
In my office arachne is connected to a LAN network and she runs like a
charm, without any errors in TCP/IP-statistic.
Mybe the COMx-Part in epppd.exe and/or core.exe is written in 'C', pure
ASM will be faster.
It's no problem to run the UART16550 with 115200Bd with a single task like
'laplink', but in this case the software has only to handle the COM-port,
read/save some files and services the graphic adaptor in text mode.
If browsing the net, the CPU has much more to do:
handling the COM-port is first priority, read/writing cache, writing temp-files
and writing to the time consuming graphic adaptor (in praphic mode) without
loosing one byte from/to the COM-port.
Regards
G�nter
Guenter Bietzig, Essen, Germany. Arachne BUG-,CRASH-,WISH-& LOVElist at:
Arachne Help Page http://home.germany.net/101/124262/gb.htm
