igb statistics error

[beezarliu]

It's hard to believe it's switch's problem or unicast issue, 
because all the 82576/82571 NICs are on the same switch.

I even have done a testing.
I put one 82571 and one 82576 card in the same machine. And all of the
NICs are plugged into a same switch. And they are not configued
any IP address, to exclude the unicast issue.  
And I found the same result.
82576's tpr > 82578's gprc = 82571's tpr = 82571's gprc.

So I'm really curious about the TPR. Is the meaning/implementation
changed for 82576? 

Thanks
2010-07-21 



beezarliu 



发件人： Ryan Stone 
发送时间： 2010-07-20  22:41:20 
收件人： beezarliu 
抄送： freebsd-net; Jack Vogel 
主题： Re: Re: igb statistics error 
 
The extra packets counted in tpr are packets received by the interface
that were not addressed to that interface.  The fact that your machine
with a 82571 has not seen any such packets is just a coincidence.
Whatever switch that machine is connected to has happened not to have
flooded unicast packets to an unknown destination in the time that the
machine has been up.