fxp driver performance expectations

Charles Swiger cswiger at mac.com
Thu Jun 15 18:57:55 UTC 2006

On Jun 15, 2006, at 2:25 PM, Paul Marciano wrote:
> For larger packets (e.g. 700 bytes) I am getting
> 100Mbps throughput port to port.
> For min-size packets (64 bytes) I am only seeing
> around 60Mbps.  Increasing HZ and the polling
> parameters does not help.

You should be aware that the minimum 64-byte packet size does not  
count the 8-byte ethernet frame preamble (well, 7 bytes of preamble  
and 1 byte called the "start frame delimiter"), which means that  
you'll only be able to get a theoretical maximum of about 87 Mbps of  
packet data through at the 64-byte packet size.


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