Re: bad PPP Performance (with and without IRQTUNE)

Edward Welbon (
Thu, 5 Sep 1996 09:47:23 -0500 (CDT)

Sorry, I guess I let this bounce, my PPP is fast, but it drops often
and I am not using diald as yet.

On Wed, 4 Sep 1996, Edward Welbon wrote:

> On Wed, 4 Sep 1996, Michael Neuffer wrote:
> > Symptoms: system is normally lightning FAST. Compiles a complete kernel, on
> > an Iomega Jaz drive in about 3-4 minutes (distclean, depend, make, zlilo,
> > modules, modules_install).
> Very good, I'd like to know more of the details of the configuration.
> > PPP is on either Motorola BitSRFR PRO (115,200 on one B channel) or a new USR
> > Sportster ``33.6 capable'', again, at 115,200.
> >
> > setserial /dev/cua{1,2} spd_vhi is done on both.
> >
> > Using CU, either on the built-in UARTs or the external one, serial I/O is FAST.
> > Hard to measure but flies on the screen, with the ISDN linke visibly faster.
> >
> > Running PPP (pppd 2.2.0f) disconnects two/three times upon dialup from
> > either line. Once connection is established, performance is horrendous.
> > Typically ftp will do 800 bytes/sec on the ISDN line. Less on the
> > modem.
> Um, 800 bytes/second is a mite slow.
> Is this MLPPP on two channels or is this one channel. I find that
> non-PAP and non-CHAP connections are abysmal. On my BSPro (with 1H
> firware) I get about 10KB/s with 115200, with 230400 baud, I get about
> 13.7Kb/s. This is the effective rate, I don't know what the bit rate
> is (encapsulation and all that ya know).
> I am running 2.2.0e and 2.2.0f (on the other system), the system that I
> usually measure ISDN performance on is a 133Mhz 486. It has kernel
> 1.3.97, the kernel one the other system 1.99.9
> It should work. I would be surprised to see that the P6 is the problem,
> but I would also be surprised that the P6 is going to help get you over
> 13.7KB/s. There is encapsulation overhead everywhere. It will cost in
> terms of bit bandwidth and processing time.
> ---
> Ed Welbon;;

Ed Welbon;; 

"I only feel what touches me, and feeling touching I can see, a better state to be in. Who has the right, to question what I must do, in only trusting the real, and things I feel?"

Ian Anderson