Re: massive collisions on RealTek8139 (kernelmodule 8139too) in kernel 2.4.18-19.8.0

From: Mircea Ciocan (mirceac@interplus.ro)
Date: Wed Feb 05 2003 - 17:51:54 EST


        Hi James,

        You're running a what is called "3-wire setup", that mean your cable
have only 3 valid wires and one that is dangling, either because of the
patch cable or the network sockets itself, I had this problem and was
tearin my hair apart because of the asymetry in traffic speed that you
saw and also because that was was NO bloody change on the card and
switch leds, they were happyly reporting 100Mb/s, full duplex even !!!
        The situation cracked when I tryed the cable on an old 10 Mb only hub
and that one didn't want to lit its leds, the capacitive coupling or
whatever was making the switch show corect link leds was not working
anymore. So after that I experimented with the treacherous cable by
repairing it and then cuting a wire on each active pair on turn and that
was it, in most cases on 100Mb/s the switch and card leds were OK but
the speed was gone on the afected pair/directiom.

        Hope that helps,

        Mircea C.

James Gunning wrote:
>
>
> D Qi wrote:
>
>> You need to make sure the full/half duplex mode setting for you laptop
>> side matches the other side, e.g. the switch, hub or NIC.
>
>
> Thanks for the suggestion D, but it unfortunately full duplex makes *no*
> difference :-(
> Collisions are still massive.
> Have pretty well run out of ideas.....
>
>>
>>
>> James Gunning wrote:
>>
>>> Hi folks,
>>> I have redhat 8 installed on an recent Asus L3C laptop.
>>> Uses the 8139too module.
>>> Ethernet seems to work, but
>>> i/s very slow /(about 500k/sec) sending data *from* the laptop. (The
>>> other way is ok).
>>> Massive collisions seem to occur (see below)
>>> Anybody have any idea?
>>>
>>> Thanks in advance,
>>> James.
>>> ___________________________________________________________________________________
>>>
>>>
>>> Other useful information.....
>>>
>>> % dmesg|grep Real
>>> Real Time Clock Driver v1.10e
>>> eth0: RealTek RTL8139 Fast Ethernet at 0xe2906000, 00:e0:18:a7:f0:e9,
>>> IRQ 9
>>>
>>> % uname -a
>>> Linux ophelia.dpr.csiro.au 2.4.18-19.8.0 #1 Thu Dec 12 05:39:29 EST
>>> 2002 i686 i686 i386 GNU/Linux
>>>
>>>
>>> % lsmod
>>> Module Size Used by Not tainted
>>> binfmt_misc 7528 1
>>> nfsd 79920 8 (autoclean)
>>> nfs 82564 7 (autoclean)
>>> lockd 58064 1 (autoclean) [nfsd nfs]
>>> sunrpc 79324 1 (autoclean) [nfsd nfs lockd]
>>> ds 8712 2
>>> yenta_socket 12960 2
>>> pcmcia_core 54784 0 [ds yenta_socket]
>>> 8139too 17704 1
>>> mii 2156 0 [8139too]
>>> iptable_filter 2412 0 (autoclean) (unused)
>>> ip_tables 14936 1 [iptable_filter]
>>> ide-scsi 10512 0
>>> scsi_mod 107240 1 [ide-scsi]
>>> ide-cd 33608 0
>>> cdrom 33696 0 [ide-cd]
>>> ohci1394 20108 0 (unused)
>>> ieee1394 46892 0 [ohci1394]
>>> mousedev 5524 1
>>> keybdev 2976 0 (unused)
>>> hid 22244 0 (unused)
>>> input 5920 0 [mousedev keybdev hid]
>>> usb-uhci 26188 0 (unused)
>>> usbcore 77024 1 [hid usb-uhci]
>>> ext3 70336 3
>>> jbd 52212 3 [ext3]
>>>
>>> % ifconfig eth0
>>> eth0 Link encap:Ethernet HWaddr 00:E0:18:A7:F0:E9 inet
>>> addr:138.194.136.69 Bcast:138.194.136.255 Mask:255.255.255.0
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:8409 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:12301 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:8977 txqueuelen:100
>>> RX bytes:985352 (962.2 Kb) TX bytes:17151377 (16.3 Mb)
>>> Interrupt:9 Base address:0x6000
>>>
>
>
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