RE: 100Mbps Ethernet Speed/Efficiency
From: Chalonec Roger (Chalonec.Roger_at_pbgc.gov)
Date: 04/06/04
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Date: Tue, 6 Apr 2004 06:49:48 -0400 To: "For users of Fedora Core releases" <fedora-list@redhat.com>
>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@redhat.com
[mailto:fedora-list-bounces@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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- Previous message: Tom 'Needs A Hat' Mitchell: "Re: install disk of Fedora Core Test2"
- Maybe in reply to: Ow Mun Heng: "100Mbps Ethernet Speed/Efficiency"
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