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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] igb: Record hardware RX overruns in net_stats
Date: Tue, 05 May 2009 11:58:19 -0700 (PDT)
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From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Tue, 5 May 2009 11:47:09 -0700

> NAK.  RNBC is not a counter for buffer overruns, and so should not be
> counted as such.

I'd say technically it is, it indicates that more packets arrived than
the available receive buffers could handle.

If anything, this is the closest this device has for this kind of
situation, and it's useful for diagnosing problems.