[Beowulf] Re: typical latencies for gigabit ethernet

Gerry Creager gerry.creager at tamu.edu
Sun Jun 28 09:15:23 PDT 2009

Dave Love wrote:
> Rahul Nabar <rpnabar at gmail.com> writes:
>> What are typical latencies I ought to be seeing with gigabit eth? 
> I have some data at http://www.nw-grid.ac.uk/LivMPI
> Note that you may have to tune the driver parameters to get the lowest
> latency.


Can you say something about any tuning you did to get decent results? 
We've had some interesting problems (until lately; new broadcom drivers 
helped) getting decent performance.  We're using Dell 1950's with 
Harpertown and broadcom NICs are native.

Which driver parms had to get tweaked?

Thanks, Gerry
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.862.3983
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