Wilken Boie wrote:
> > Hallo RTAIers,
> >
> > it seems kind of strange, but each time I use ppp (for internet
> > access, over a serial port and an external ISDN adadpter) I
> > have to rmmod rtai_sched. Otherwise ppp still works but the
> > throughput becomes practically unusable.
>
> > Details
> > Looking at a thruput plot it looks as if a transfer was
> > starting as normal but after a moment the thruput drops
> > severely (mostly close to zero). After a few seconds this
> > repeats. During a file download I can pretty consistenly
> > switch the problem off and on by ins/rmmod rtai_sched
> > (upscheduler).
>
> > System
> > K6/233, serial: ISA 4port with standard driver irq 14
> > RTAI: both 1.1 (from http://www.timesys.com RT package) and 1.3
> > Linux: 2.2.14
> >
Hi Wilken,
I have tried to reproduce this problem on my system, but everything
seems fine, no slow down. I started pppd and set a long ftp running. I
checked the transfer rate by looking at the pacing of hash marks. There
was no slow down. I'm using the latest RTAI-1.4 (but the result should
be the same on 1.3). The only obvious difference is that you report the
serial interrupt in 14 on your system, on most that I have looked at 14
is usually the ide hard drive interrupt (I don't know if this is
significant). Here is my output from /proc/interrrupts:
# cat /proc/interrupts
CPU0
0: 106016 RT SPVISD timer
1: 3288 RT SPVISD keyboard
2: 0 RT SPVISD cascade
3: 8 RT SPVISD pcnet_cs
5: 236011 RT SPVISD serial
12: 48026 RT SPVISD PS/2 Mouse
13: 1 RT SPVISD fpu
14: 216611 RT SPVISD ide0
NMI: 0
Regards, Stuart
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