100Mbps Ethernet Speed/Efficiency

[Chalonec Roger]

>From a network standpoint the following applies:

100M(Bits)ps = 100,000,000Bps
Full Duplex  = 200,000,000Bps
In Bytes     = 100,000,000/8 = 12,500,000
In bytes FD  = 200,000,000/8 = 25,000,000
Typical Data link + TCP/IP net Overhead = 30%
Typical maximum theoretical throughput then is 70% of available
bandwidth

These are the theoretical maximums.
This assume you have the whole channel.
Any other delay is typically host related.

Hope this helps.

-----Original Message-----
From: fedora-list-bounces at redhat.com
[mailto:fedora-list-bounces at redhat.com] On Behalf Of WipeOut
Sent: Tuesday, April 06, 2004 6:40 AM
To: For users of Fedora Core releases
Subject: Re: 100Mbps Ethernet Speed/Efficiency


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                                            
>
>
>        
>
>
>  
>
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..


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