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slow getty on serial port

slow getty on serial port

Post by John Holla » Tue, 02 May 1995 04:00:00



I just added two serial ports to my box to allow, among other things,
incoming terminal connections. So I start up a terminal program on my Mac
and connect it and set it up as per the Serial-HOWTO. It connects and
works. But it responds about like a VAX with 2000 people on it! Upon
bootup or >init q the Mac program gets the Linux login prompt a few
letters at a time with long (approx 10 secs) pauses in between. It takes
equally long to echo characters typed in and so forth. Performance seems
better when it is cranking something out; a ls -R of the whole file
system has pauses but they are much shorter.

My box is a Pentium 90 Intel Motherboard with IDE HD and CD-ROM, the four
serial ports are all 16550s on different IRQs, I just installed Linux
from the March Info-Magic Slackware with the IDECD1 kernel. I haven't
recompiled the kernel yet or odne much of anything to the system. I'm
also printing to a serial printer....
The connection in question is at 38400 bps.
Anyone know if I can get a snappier performance or out of curiousity,
where the bottleneck is?

John Holland

 
 
 
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slow getty on serial port

Post by Zenon Fortu » Wed, 03 May 1995 04:00:00




>I just added two serial ports to my box to allow, among other things,
>incoming terminal connections. So I start up a terminal program on my Mac
>and connect it and set it up as per the Serial-HOWTO. It connects and
>works. But it responds about like a VAX with 2000 people on it! Upon
>bootup or >init q the Mac program gets the Linux login prompt a few
>letters at a time with long (approx 10 secs) pauses in between. It takes
>equally long to echo characters typed in and so forth. Performance seems
>better when it is cranking something out; a ls -R of the whole file
>system has pauses but they are much shorter.

I had a similar behavior on the ttyS2 line. It happened, that it shared its
IRQ with the invisible IRQ of the second parallel port (which I wanted to
disable, but did not do it right). I would bet that your serial ports share
their IRQs with something.

        Zenon

 
 
 
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1. Newbie and problems with getty and serial ports

I am quite new in Linux and have a problem with getty.

I am 'only' trying to connect a dumb terminal with a linux box.

I have test the /etc/gettydefs file and it is correct (well it says the
same that my manual). I have configured the file /etc/rc.d/rc.serial as
the manual says.

if i execute from the console:

        /sbin/getty ttyS1 DT9600 vt100

my terminal works fine, so it is not a cabling problem, but when i
logout i cannot log again until i go to the console and execute the
command again.

Then i said, OK i need to respwn it in the /etc/inittab file and i put a
new line on it as:

        S1:456:respawn:/sbin/getty ttyS1 DT9600 vt100

and execute :

        init q

My terminal does not work.
Then i reboot the machine, it does not work

If i execute again the line from the console it works again perfectly
until i logout

I am lose

Help

Thanks in advanced

joseba real de asua

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