igb interfaces and kern.ipc.nmbclusters

Adrian Chadd adrian at freebsd.org
Sun Nov 16 17:29:31 UTC 2014

That default is high and should be fine for almost all uses at 1g.


On 15 November 2014 07:26, Arthur Chance <freebsd at qeng-ho.org> wrote:
> man igb contains the section
> kern.ipc.nmbclusters
>         The maximum number of mbuf clusters allowed.  If the system has
>         more than one igb card or jumbo frames are enabled, this value
>         will need to be increased.
> Given that I'm in the process of setting up a new server with two igb
> interfaces, is there a suggestion for what I should set it to?
> My current value is
> root at arthur:4# sysctl kern.ipc.nmbclusters
> kern.ipc.nmbclusters: 2020126
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