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Date: Thu, 02 Oct 1997 19:42:50 +0200
From: Marco Masotti <mc7953@mclink.it>
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Subject: Re: tty-level buffer overflows
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> From: Greg Lehey <grog@lemis.com>
> Date: Thu, 2 Oct 1997 14:24:20 +0930
> Subject: Re: tty-level buffer overflows
> 
> On Wed, Oct 01, 1997 at 10:51:09PM -0500, Jonathan E. Lyons wrote:
> > Is this anything to be concerned about? I've got an X2 modem, with the port
> > speed set at 57600.....
> >
> >
> > Sep 28 16:42:11 cplkagan /kernel: sio0: 660 more tty-level buffer overflows
> > (total 660)
> > Sep 29 13:52:41 cplkagan /kernel: pid 18534 (ping), uid 0: exited on signal 3
> > Sep 30 21:05:02 cplkagan /kernel: sio0: 100 more tty-level buffer overflows
> > (total 760)
> > Sep 30 22:00:02 cplkagan /kernel: sio0: 198 more tty-level buffer overflows
> > (total 958)
> > Sep 30 22:05:01 cplkagan /kernel: sio0: 199 more tty-level buffer overflows
> > (total 1157)
> > Sep 30 22:05:02 cplkagan /kernel: sio0: 1076 more tty-level buffer
> > overflows (total 2233)
> > Oct  1 05:30:02 cplkagan /kernel: sio0: 940 more tty-level buffer overflows
> > (total 3173)
> 
> Yes.  With PPP, each of these means a lost packet, which is expensive.
> This shouldn't happen.  Is the machine slow or heavily loaded?
> Otherwise you might be losing interrupts.

I use to get these messages on a Pentium 75 machine from Intel. PPP is
great under all conditions, but, quite strange to happen, when uploading
data using cu, plenty of these messages come across.

The motherboard reports on boot:

FreeBSD 2.1.7-RELEASE #0: Tue Apr 22 09:20:20 MET 1997   
root@dview.roma.reuters.:/usr/src-freebsd/sys/compile/MULTICAST_EP0_GENERIC
CPU: 75-MHz Pentium 735\\90 or 815\\100 (Pentium-class CPU)
  Origin = "GenuineIntel"  Id = 0x524  Stepping=4
  Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>

Opinions?

Marco


PS: Actually, I never tried under Freebsd cu uploading using a different
unit/type of Pc from the one mentioned.