Re: [gentoo-user] Re: Network collisions

[Dave Oxley <dave@daveoxley.co.uk>]

Ok, I've fixed the problem. I've plugged both systems into my router 
(which is a switch) and they are working fine now. There is obviously a 
bug in the 8139too driver. I'll have to live with the long cables going 
to the switch for the time being though!!

Cheers for everyones help.
Dave.

James wrote:

>Dave Oxley <dave <at> daveoxley.co.uk> writes:
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>>Yeah, its a hub. I'll stop trying to set it to full duplex now.
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>>It is 40 times quicker in one direction than the other. Can you 
>>give me a hint where to go from here.
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>Try connecting the 2 systems  with only a 'cross-over cable' run the applications
>and make measurements. If this results in an increase in the bandwidth 
>in either direction, you may want to put systems back on the hub, and 
>have a third system run ethereal. Look at your data traffic and see 
>if anythingelse is using the bandwidth from either of these 2 system 
>or what else is plug into the hub/switch.
>
>Is the hub a 10Mbps only hub/switch, check that. On 10 Mbps ethernet 
>hubs,you can never reach the full 10 Mbps, in fact with many systems 
>chattering,the practical throughput is marginally around 33%.
>
>If when you are on the cross over cable and you get similar poor 
>results,then the problem may be in the ethernet driver code, 
>kernel, irq settings or
>some other low level part of the kernel/modules, especially if 
>you get the same skewed results with several different 
>applications moving data between the systems. But, if when
> you move data between these 2 isolated system, and 
>get different bandwidth performance semantics, then the problem 
>is most likely between the applications or a bottleneck in the 
>application code (poor data structure for example).
>
>Make sure you computers are not resource limited, thus blocking 
>the processthat you are running to move the data. Top and ntop 
>are just a few toolsto help track down these sort of issues.
>
>Sadly, you may have a complex mix of part or all of these 
>aforementioned issues... 
>
>hth,
>James
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