Intel 4-port ethernet adaptor link aggregation issue

[Barney Cordoba]

That's way too high. Your base rx requirement is 

Ports * queues * rxd 

With a quad card you shouldn't be using more than 2 queues, so your requirement
with 5 ports is 10,240 just for the receive setup. If you're using 4 queues that
number doubles, which would make 25,600 not enough. 

Note that setting mbufs to a huge number doesn't allocate the buffers; they'll be
allocated as needed. It's a ceiling. The reason for the ceiling is so that you don't
blow up your memory. If your system is using 2 million mbuf clusters then you
have much bigger problems than LAGG.

Anyone who recommends 2 million clearly has no idea what they're doing.

BC


________________________________
 From: Joe Moog <joemoog at ebureau.com>
To: freebsd-net <freebsd-net at freebsd.org> 
Sent: Wednesday, August 28, 2013 9:36 AM
Subject: Re: Intel 4-port ethernet adaptor link aggregation issue
 

All:

Thanks again to everybody for the responses and suggestions to our 4-port lagg issue. The solution (for those that may find the information of some value) was to set the value for kern.ipc.nmbclusters to a higher value than we had initially. Our previous tuning had this value set at 25600, but following a recommendation from the good folks at iXSystems we bumped this to a value closer to 2000000, and the 4-port lagg is functioning as expected now.

Thank you all.

Joe

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