em0 performance subpar

[Adam Stylinski]

On Thu, Apr 28, 2011 at 10:30:31AM -0400, Mike Tancsa wrote:
> On 4/28/2011 10:15 AM, Adam Stylinski wrote:
> 
> > 
> > em0: <Intel(R) PRO/1000 Legacy Network Connection 1.0.3> port 0xe800-0xe83f mem 0xfe9e0000-0xfe9fffff,0xfe9c0000-0xfe9dffff irq 20 at device 5.0 on pci7
> > em0: [FILTER]
> 
> I am not sure the newer driver will help performance wise. It might fix
> that bug you saw at least.  Jack from intel might be able to shed some
> light on it. In the mean time, try generating traffic via netblast.
> Another tool I find helpful in narrowing down tcp performance
> differences is netperf
> 
> 	---Mike
> 
> 
> -- 
> -------------------
> Mike Tancsa, tel +1 519 651 3400
> Sentex Communications, mike at sentex.net
> Providing Internet services since 1994 www.sentex.net
> Cambridge, Ontario Canada   http://www.tancsa.com/

./netblast 192.168.0.121 5001 32768 30

start:             1304002549.184689025
finish:            1304002579.187555311
send calls:        2163162
send errors:       2095950
approx send rate:  2240
approx error rate: 0

? This output is a bit cryptic but from what I think I understand from the source code it's the number of successful sends of the payload size in 30 seconds.  

So to do the math: 
(32768*2210)/(1024*1024)
69.06250000000000000000MB/sec?  This is still only saturating about half the link speed.


-- 
Adam Stylinski
PGP Key: http://pohl.ececs.uc.edu/~adam/publickey.pub
Blog: http://technicallyliving.blogspot.com
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