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Date: Sat, 21 Aug 2010 09:32:52 -0700
From: "Jason C. Wells" <jcw@speakeasy.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Typical Network Performance
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On 08/08/10 22:10, perryh@pluto.rain.com wrote:
> "Jason C. Wells"<jcw@speakeasy.net>  wrote:
>    
>> By process of elimination (swap cables, swap ports, try different
>> host pairs) I was able to discover that a single server on my home
>> LAN was getting about 1.6% performance compared to other servers
>> getting 94%
>>      
> ...
>    
>> What would be the next step to figuring out why this host's network
>> performance is slow?
>>      
> My next step would be to check whether this host and its hub/switch
> port agree on speed and duplex -- occasionally some combination
> of netcard phy and switch type gets the negotiation wrong.  Duplex
> mismatch, in particular, can have huge performance impact.
>    

I needed a windows utility to connect to my switch.  Instead I just 
added a realtek NIC to my server to replace the Marvell on-board NIC.  
After this, network load using 'nc' to pipe 1MiB gives 98% transfer 
rate.  Even though I don't know what the problem was, I consider the 
problem solved.  Thanks.

Jason