From owner-freebsd-hackers@FreeBSD.ORG  Wed Feb 17 10:52:38 2010
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Subject: Re: Sudden mbuf demand increase and shortage under the load (igb
 issue?)
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Maxim Sobolev wrote:

> So it looks like kernel issue of a sort, which causes all userland
> activity to cease for 2 minutes when the system reaches certain load.

You are not using ZFS, are you? :))