em0 NIC slow on 8.2-p1 amd64?

Michael W. Lucas mwlucas at blackhelicopters.org
Fri Jul 22 20:26:36 UTC 2011

On Fri, Jul 22, 2011 at 04:15:11PM -0400, Mike Tancsa wrote:
> On 7/22/2011 4:10 PM, Michael W. Lucas wrote:
> > 
> > 
> >     3.65  419155.4
> Thats 400Mb/s no ?   Whats the CPU in this thing ? Also your NIC version
> was 7.1.9.  RELENG_8 has 7.2.3. Can you try that version if possible ?

<facepalm> I sit corrected, decimal point error. My apologies, long
day here.

For the CPU, 400Mbs isn't bad.

CPU: Intel(R) Celeron(R) CPU          420  @ 1.60GHz (1600.01-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x10661  Family = 6  Model = 16  Stepping = 1
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant

My ~30MB/s from applications is roughly 240Mb/s. 

Will applications such as NFS cut bandwith usage that much?

I'll try the newer driver.

> > So no, I'm not saturating this network. Not even close. I have a
> > machine with a 100Mbs vr0 that can spit out twice that much.
> How could FastE nics do 800Mb/s ?

Same decimal point error. It's clearly time for me go home.


Michael W. Lucas 	
http://www.MichaelWLucas.com/, http://blather.MichaelWLucas.com/
Latest book: Network Flow Analysis http://www.networkflowanalysis.com/
mwlucas at BlackHelicopters.org, Twitter @mwlauthor

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