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

From: James Gunning (James.Gunning@csiro.au)
Date: Wed Feb 05 2003 - 18:00:18 EST


Mircea Ciocan wrote:

> 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.

Hi Mircea,
           Thanks very much for your suggestions.
My only objection to your reply is that I get decent transfer rates
(both ways) and few collisions when I use the same hardware
booted into windows XP. So i'd figured it was a driver issue............

James.

>
>
> 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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