[Beowulf] Re: typical latencies for gigabit ethernet

Gerry Creager gerry.creager at tamu.edu
Sun Jun 28 12:15:23 EDT 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.

Dave,

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
Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843
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