[vortex] Slow connection in local domain

[Suikat, Reiner]

Hello,

I'm experiencing a strange problem with Linux on my laptop. Any connection
within the local domain is extremely slow (< 5kB/sec), anything going
outside is normal (up to 200kB/sec).

Some information about my machine and setup:
HW: Toshiba Portege 7140CT with Network Dock II
(ethernet onboard in the docking station)

SW: Redhat 7.1 with SGI XFS (SGI's XFS-1.0 RedHat installer CD)
(Kernel upgraded to 2.4.4, but problem was in the original 2.4.2 kernel
also)

Startup Messages from 3c59x driver:
May 17 09:27:13 beetlejuice kernel: eth0: 3Com PCI 3c905C Tornado at 0xfb00,
00:00:39:71:33:24, IRQ 11
May 17 09:27:13 beetlejuice kernel:   product code 0000 rev 00.11 date
00-00-00
May 17 09:27:13 beetlejuice kernel: Full duplex capable
May 17 09:27:13 beetlejuice kernel:   8K byte-wide RAM 5:3 Rx:Tx split,
autoselect/Autonegotiate interface.
May 17 09:27:13 beetlejuice kernel:   MII transceiver found at address 24,
status 782d.
May 17 09:27:13 beetlejuice kernel:   Enabling bus-master transmits and
whole-frame receives.
May 17 09:27:13 beetlejuice kernel: eth0: scatter/gather enabled. h/w
checksums enabled
May 17 09:27:13 beetlejuice kernel: eth0: using NWAY device table, not 8


Output from ifconfig eth0:
eth0       Linkverkapselung:Ethernet  HWaddr 00:00:39:71:33:24
          inet addr:129.247.35.172  Bcast:129.247.47.255
Maske:255.255.240.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Empfangene Pakete:8427 Fehler:3 Weggeworfen:0 Überlauf:0 Rahmen:6
          Verschickte Packete:18 Fehler:0 Weggeworfen:0 Überlauf:0 Rahmen:0
          Kollisionen:0 Sendewarteschlangenlänge:100
          Interrupt:11 Basisadresse:0xfb00

The network setup (own ip, netmask, router and name server) is correct for
our local net. There are no error messages in the message log file, not even
with debug=6 set for the driver. 

The same machine running under Windows 2000 achieves almost the full
10MB/sec on our local net.

BTW, Win2000 reports a 3C920 (3C905-TX compatible) network adapter.

I have no idea how to debug the problem. Does anyone on this list have a
clue what could be causing this or what are sensible steps to find out? 

Thanks for any help you can provide

Reiner

--
German Aerospace Center (DLR)
Institute of Flight Guidance
Dr.-Ing. Reiner Suikat
Tel: (49) 531-295-2552
Fax: (49) 531-295-2550
E-Mail: Reiner.Suikat@dlr.de