From owner-freebsd-net@FreeBSD.ORG  Wed Apr 18 23:40:45 2012
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From: Sean Bruno <seanbru@yahoo-inc.com>
To: Jack Vogel <jfvogel@gmail.com>
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Date: Wed, 18 Apr 2012 16:40:17 -0700
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Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>,
	Luigi Rizzo <rizzo@iet.unipi.it>
Subject: Re: igb(4) Raising IGB_MAX_TXD ??
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On Wed, 2012-04-18 at 09:49 -0700, Sean Bruno wrote:
> ok, good.  that at least confirms that I correctly translated between
> the driver code and documented specification.  
> 
> I will try 8k as a test for now and see how that runs.  
> 
> sean

For now, I've patched one front end server with: 
/usr/src/sys/dev/e1000/if_igb.h:#define IGB_MAX_RXD             4096 * 4

And adjusted hw.igb.rxd: 8192

So far so good, been running in production for a couple of hours so the
"smoke test" for this setting seems to be happy.

We'll continue to adjust and test tomorrow during higher load
conditions.

Sean