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:
Yeah, its a hub. I'll stop trying to set it to full duplex now.
It is 40 times quicker in one direction than the other. Can you
give me a hint where to go from here.
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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