Messages in this thread | | | Date | Thu, 26 Nov 1998 02:36:16 +0100 | From | Matthias Sattler <> | Subject | Re: 2.1.129-ac3 severe RX errors in PPP |
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Hiho
I've seen similar problems. For me the pppsession starts very slow (~300 bytes/sec) and sometimes gets a bit faster in average (~2.5Kb/sec) for small files. Sometimes it stays that slow all the time. With "big" (>~10Kb) files I see the connection starting nearly reasonably fast for my connect speed and then suddenly stopping for many seconds resulting in a very bad average transfer rate. During these hangs the recieve/transmit leds of my modem are both off.
With the tcpdump output found at http://www.unix-ag.uni-kl.de/~sattler/ppptcpdump you can observe both the slow start at the very beginning and the stalled transfer at the very end. The middle part is just a typical session.
Lets have a look at my setup to find out what we have in common.
My machine: - dual P100 on gigabyte board with intel HX chipset. - ide harddisc: (hdparm -u /dev/hda -> unmaskirq = 1 (on)) - scsi harddisc and other stuff (adapec 2940UW on board) But there is usually not much hd activity during the ppp connection. - PS/2 mouse (generates MANY interrupts) - ne2k ISA that is set up (correctly), but not connected to a network. - 3Com (U.S. Robotics) voice modem with recent firmware. Connected to the on board serial port (16550 compatible) with 115kbit/sec. - SMP 2.1.130-pre3 with devfspatch and earlier kernels (without devfs) - ppp built as module loaded by kmod. - pppd --version -> pppd version 2.3 patch level 5 - the ppp session is started with kppp (KDE ppp frontend). - gcc --version -> egcs-2.91.55
The ppp reciever is a Livingston portmaster 3 and the www-server in the example is a sun supersparc running solaris 2.5.1 but it happens with all hosts I've found.
Here come some additional details...
My connect string is: CONNECT 45333/ARQ/V90/LAPM/V42BIS
/sbin/ifconfig ppp0 Link encap:Point-to-Point Protocol inet addr:131.246.94.16 P-t-P:131.246.119.5 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:4866 errors:3 dropped:0 overruns:0 frame:3 TX packets:5266 errors:0 dropped:0 overruns:0 carrier:0 Collisions:0
/sbin/route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface pm.rhrk.uni-kl. * 255.255.255.255 UH 0 0 0 ppp0 192.16.1.0 * 255.255.255.0 U 0 0 0 eth0 192.16.1.0 * 255.255.255.0 U 0 0 0 eth0 127.0.0.0 * 255.0.0.0 U 0 0 0 lo default pm.rhrk.uni-kl. 0.0.0.0 UG 0 0 0 ppp0
traceroute www.unix-ag.uni-kl.de traceroute to pizza.unix-ag.uni-kl.de (131.246.89.1), 30 hops max, 40 byte packets 1 pm.rhrk.uni-kl.de (131.246.119.5) 147.838 ms 133.856 ms 139.301 ms 2 vgw6-s119-b34-3-3.rhrk.uni-kl.de (131.246.119.253) 142.958 ms 135.239 ms 138.681 ms 3 pizza.unix-ag.uni-kl.de (131.246.89.1) 139.47 ms 138.117 ms *
Matthias
PS: Do I have forgotten something important?
PPS: I've just found out, that seyon crashes the computer instantly. Could this be devfs???
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