From owner-freebsd-net@FreeBSD.ORG  Thu Oct 20 12:49:42 2005
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Date: Thu, 20 Oct 2005 22:49:29 +1000
From: Michael VInce <mv@roq.com>
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Cc: freebsd-net@freebsd.org, stable@freebsd.org
Subject: Re: Network performance 6.0 with netperf
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Sten Daniel Sørsdal wrote:

>Michael VInce wrote:
>
>  
>
>>I reinstalled the netperf to make sure its the latest.
>>
>>I have also decided to upgrade Server-C (the i386 5.4 box) to 6.0RC1 and
>>noticed it gave a large improvement of network performance with a SMP
>>kernel.
>>
>>As with the network setup ( A --- B --- C  ) with server B being the
>>gateway, doing a basic 'fetch' from the gateway (B) to the Apache server
>>(C) it gives up to 700mbits/sec transfer performance, doing a fetch from
>>server A thus going through the gateway gives slower but still decent
>>performance of up to 400mbits/sec.
>>    
>>
>
>Are you by any chance using PCI NIC's? PCI Bus is limited to somewhere around 1 Gbit/s.
>So if you consider;
>Theoretical maxium = ( 1Gbps - pci_overhead )
>
>  
>
The 4 ethernet ports on the Dell server are all built-in so I am 
assuming they are on the best bus available.

Mike