On Thu, 20 Oct 2005, Michael VInce wrote:
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.
At the performance levels you're interested in, it is worth spending a bit
of time digging up the specs for the motherboard. You may find, for
example, that you can achieve higher packet rates using specific
combinations of interfaces on the box, as it is often the case that a
single PCI bus will run to a pair of on-board chips. By forwarding on
separate busses, you avoid contention, interrupt issues, etc. We have a
number of test systems in our netperf test cluster where you can measure
20% or more differences on some tests depending on the combinations of
interfaces used.
Robert N M Watson
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