kern.ipc.nmbclusters limit reached makes a server go down, please help

Brian brian at
Tue Jun 24 16:42:23 UTC 2014

On 6/24/2014 6:52 AM, Stefan Stere wrote:
> Hi,
> I have a vmware virtual server running FreeBSD 10.0 STABLE
> The virtual server has 100mbps port.
> It is running a Tor router, consuming an average of 6-7 TB of monthly traffic. Its the only purpose of the server.
> Last night it went down, and vmware console log was saying:
> [zone: Mbuf_cluster] kern.ipc.nmbclusters limit reached
> I don't know what this means - the traffic of the server is unlimited and nothing is capped in any way. What can I do to fix this? I have read on freebsd wiki that I might need to add some lines to sysctl ? can you please confirm? Thank you in advance.
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Try netstat -m to see how many are being used.
There is some info here also


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