100Mbps Ethernet Speed/Efficiency

[WipeOut]

Ow Mun Heng wrote:

>Hi Guys,
>
>I'm wondering what's the maximum sustained transfer rate
>that one can experience when using a 100Mbps link? 
>
>Is there any way that I can determine what's the bottleneck?
>FYI, I'm using iftop.
>
>Transferring files between 2 PCs, (laptop and Desktop)
>I see like up to 20MB/s. 
>
>Could this # be limited due to my slow HD? 4200rpm which
>hdparm -t (or is it -T) gives ~26MB/s
>
>1mbps = 1024/8 bits = 1 MB/s (I know there's a conversion
>but I'm forgetful)
>
>
>Cheers,                                                 
>Mun Heng, Ow                                            
>
>
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Without compression and overhead 100Mb/s transtales to about 12.5MB/s..

Of course that is the theoretical maximum..

If you add overhead and contention you will probbaly see an actual 
transfer of between 60Mb/s and 90Mb/s..

I am not sure how you have managed to see a throughput of 20MB/s on a 
100Mb/s link..

Later..