Re: [mu TECH] terminal speed

From: Mike Johnson (
Date: Tue May 30 2000 - 01:01:59 CEST

On several projects I have done realted to streamed content and socket
connections, typically you have to adjust your buffer sizes to make good use
of high speeds, and visa versa.. buffersize affects how many round trips
back to the stream source you need to make, and a number of API calls.. and
having a 1 byte buffer can seriously affect performance over a 48k buffer.
Look at memory usage in the two cases and see if a larger buffer is being
used in the high baud rate. If so, then that will show you what trade-offs
you have to make...

In other words, I agree so long as you have enough memory.


----- Original Message -----
From: "Alfie Costa" <>
To: <>
Sent: Monday, May 29, 2000 1:36 PM
Subject: [mu TECH] terminal speed

> A question about virtual console/tty speed...
> In /etc/inittab there are lines which setup the 6 default tty consoles;
> example:
> c1:45:respawn:/bin/agetty 38400 tty1
> ...which I think makes the first screen output data at 38400bps. My
> is whether it is faster or slower for Linux, (or desirable for users in
> general), if we increase this number to 115200 or something like that.
About a
> year back I tried this with another Linux, and had no noticeable ill
> and it did speed up the response time.
> Judging from general principles and vague ideas about how the consoles
> it's uncertain whether a such a higher bps rate should speed the system up
> not. On the one hand, 115200bps would seem to require more work, slowing
> CPU down... on the other hand, the CPU probably has to spend more time
> for a 38400bps console to finish, also slowing the CPU down. Yet one must
> less work than the other. Is there a good way to measure which is the
> work?
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