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Date: Wed, 30 Mar 2011 10:33:05 -0400
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From: Arnaud Lacombe <lacombar@gmail.com>
To: Andrey Zonov <andrey@zonov.org>
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Cc: freebsd-net@freebsd.org, Jack Vogel <jfvogel@gmail.com>
Subject: Re: igb(4) won't start with "igb0: Could not setup receive
	structures"
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Hi,

On Wed, Mar 30, 2011 at 1:58 AM, Andrey Zonov <andrey@zonov.org> wrote:
> My point is if you're using machine with 8 CPUs than maxusers/clusters/9k
> mbufs should have been increased by system, because on this machine minimum
> 2Gb memory is available.
>
I am doubtful that the number of CPU[0] or number of users (yes, I
know `maxusers' is currently used to compute the default
`nmbcluster'...) can be linked to any network load pattern at all. You
can have a 24 CPU machine made for 4096 users with a single NIC, not
requiring much memory, while a 1 CPU machine with only 1 users can
have +8 NIC and require a huge quantity of memory. Available KVM space
should also be taken into account, as it is rather limited on i386.

 - Arnaud

[0]: even more today where you can have a huge number of virtual CPU.