[Cialug] OT: Gigabit speeds (was Gigabit NICs)

[Paul Gray]

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On Tue, Nov 14, 2006 at 11:29:09AM -0800, Aaron Porter wrote:
> On 11/14/06, Nathan C. Smith <smith at ipmvs.com> wrote:
> >I wonder if you could ever really approach a gigabit from any machine.
> >Anybody have any concrete data?
> 
> I snagged a few hosts from the queue, but couldn't shutdown the
> cluster run, so these numbers are from a live network. I used the
> netpipe-tcp package from Debian Etch with default options.
> 
> Intel(R) XEON(TM) CPU 2.20GHz <-> Intel(R) XEON(TM) CPU 2.20GHz
> 123: 8388611 bytes      3 times -->    894.15 Mbps in   71576.48 usec

Using netpipe-tcp across my cluster, I get 948Mbps.  Using iperf, I get
980Mbps using the tg3 drivers. 

I tune my send/receive/write TCP kernel parameters, and have 9000MTU's though.

- -- 
Paul Gray                                         -o)
314 East Gym, Dept. of Computer Science           /\\
University of Northern Iowa                      _\_V
Message void if penguin violated ...  Don't mess with the penguin
No one says, "Hey, I can't read that ASCII attachment ya sent me."
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