Re: ppp not passing long packets (probably after MPSAFE_TTY)

From: Yuriy Tsibizov <Yuriy.Tsibizov_at_gfk.ru>
Date: Sat, 6 Sep 2008 16:50:54 +0400 (MSD)
On Sat, 6 Sep 2008, Ed Schouten wrote:

> Thanks for reporting this issue. We should fix this.
>
>> Ed,
>>
>> I have one problem with ppp modem connection. I use mpd for dial-up
>> connections, but ng_tty is not working any more and I had to switch back
>> to ppp.
>>
>> With ping -s 960 I'm getting ~0% loss, with ping -s 980 I'm almost always
>> getting 100% loss... But: modem TX light turns on on every attempt to
>> send ICMP packet.
>>
>> Dial-up server is Windows 2000 RAS, and I had no problems with it for
>> last five years, mostly with mpd but ppp was OK too...
>>
>> I can't say, was ppp broken before MPSAFE_TTY changes, but in 7-CURRENT
>> days it was in good shape.
>
> Could you give me the output of `pstat -t' while using `ppp'? What
> device node/device driver are you using? I know there are some things
> fishy w.r.t. flow control, so there are a lot of things we can look in
> to.
free# pstat -t
       LINE   INQ  CAN  LIN  LOW  OUTQ  USE  LOW   COL  SESS  PGID STATE
   sysmouse     0    0    0    0     0    0    0     0     0     0 -
      dcons  7680    0    0  768  7812    0  782     0     0     0 Oi
       dgdb     0    0    0    0     0    0    0     0     0     0 -
      ttyv0  7680    0    0  768  7812    0  782   175  1741  1741 Oil
      ttyv1  7680    0    0  768  7812    0  782    13  1742  2718 Oi
      ttyv2  7680    0    0  768  7812    0  782     0  1743  2729 Oi
      ttyv3  7680    0    0  768  7812    0  782 30417  1744  2439 Oi
      ttyv4  7680    0    0  768  7812    0  782     7  1745  1745 Oil
      ttyv5  7680    0    0  768  7812    0  782    10  1746  2728 Oi
      ttyv6  7680    0    0  768  7812    0  782 103319  1747  1919 Oi
      ttyv7  7680    0    0  768  7812    0  782 24922  1748  2719 Oi
      ttyv8     0    0    0    0     0    0    0     0     0     0 -
      ttyv9     0    0    0    0     0    0    0     0     0     0 -
      ttyva     0    0    0    0     0    0    0     0     0     0 -
      ttyvb     0    0    0    0     0    0    0     0     0     0 -
      ttyvc     0    0    0    0     0    0    0     0     0     0 -
      ttyvd     0    0    0    0     0    0    0     0     0     0 -
      ttyve     0    0    0    0     0    0    0     0     0     0 -
      ttyvf     0    0    0    0     0    0    0     0     0     0 -
consolectl  7680    0    0  768  7812    0  782     0     0     0 Oi
      ttyu0     0    0    0    0     0    0    0     0     0     0 IC
      ttyu1 23040    0    0 2304 23184    0 2319 4757976     0     0 ICOol
free# uname -a
FreeBSD free.home.local 8.0-CURRENT FreeBSD 8.0-CURRENT #1: Sun Aug 31 
08:48:35MSD 2008     chibis_at_free.home.local:/usr/obj/usr/src/sys/GENERIC  i386
free# dmesg | grep uart
uart0: <16550 or compatible> at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
uart0: [FILTER]
uart1: <16550 or compatible> at port 0x2f8-0x2ff irq 3 on isa0
uart1: [FILTER]

>
> Is it somehow possible to get some kind of `debug output' from the
> Windows machine as well? Thanks!

hm... Not shure if I can dig any debugging from it. I can try to move 
modems to FreeBSD (6.3 or 7.0) machine, but it will take some time.

Yuriy Tsibizov,
GfK RUS Network Administrator
Received on Sat Sep 06 2008 - 10:52:08 UTC

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