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Date:      Sat, 15 Nov 2014 15:26:25 +0000
From:      Arthur Chance <>
To:        FreeBSD-Questions <>
Subject:   igb interfaces and kern.ipc.nmbclusters
Message-ID:  <>

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man igb contains the section

         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@arthur:4# sysctl kern.ipc.nmbclusters
kern.ipc.nmbclusters: 2020126

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