Linux-Hams archive - October 1997: Re: telnet is PAINFULLY slow...
Re: telnet is PAINFULLY slow...
Mark Herson (qakb.xpuaek@s-f.com)
Wed, 1 Oct 1997 11:49:21 +0000 (GMT)
Hi Pete,
>
> Recently started testing telnet connections to local station on 2 meter
> 1200 baud path and it is PAINFULLY slow... to the point where something
> has got to be wrong.... or to the point where it is virtually unusable.
>
> Channel activity is very low.. so that is not the problem and we have
> a good RF path. Regular AX.25 connections are reasonable speed as one
> would expect for 1200 baud.
>
> Is all of the additional TCP/IP overhead causing such slow response?
>
> We are both running Linux 2.0.30 w/AX.25
>
> When monitoring the channel using "listen" there seems to be a awful lot
> of overhead traffic.. and it transmits commands over only a few characters
> at a time... almost as if it is trying to transmit every keystroke as
> a packet.. and at 1200 baud.. this kind of handshaking can take forever..
Indeed, if you simply telnet to a host you do go into character mode and
your system is sending only a few (or one) characters per frame. Instead,
invoke telnet differently and it might work better for you:
telnet w3bg 23
that is, explicitly specify the telnet port (23) at the other end. I've
tried this and it does improve matters.
One other thing you might consider (after looking at your tracings) is to
specify some reasonable window/mss/mtu sizes in your routing statements,
suitable for ax.25
73, Mark, N2MH