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Date: Tue, 16 Feb 2010 09:23:33 -0800
From: Maxim Sobolev <sobomax@FreeBSD.org>
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To: Miroslav Lachman <000.fbsd@quip.cz>
References: <4B79297D.9080403@FreeBSD.org> <4B79205B.619A0A1A@verizon.net>
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Cc: Alfred Perlstein <alfred@FreeBSD.org>, freebsd-net@FreeBSD.org,
	Sergey Babkin <babkin@verizon.net>,
	"David G. Lawrence" <dg@dglawrence.com>, Jack Vogel <jfvogel@gmail.com>
Subject: Re: Sudden mbuf demand increase and shortage under the load
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Miroslav Lachman wrote:
> Can it be related to this issue somehow?
> 
> http://lists.freebsd.org/pipermail/freebsd-current/2009-August/011013.html
> http://lists.freebsd.org/pipermail/freebsd-current/2009-August/010740.html
> 
> It was tested on FreeBSD 8 and high UDP traffic on igb interfaces emits 
> messages "GET BUF: dmamap load failure - 12" and later results in kernel 
> panic.
> We have not received any response to this report.

Could be the issue, however in our case there is no panic, just that all 
userland activity in the system ceases for 2 minutes after it reaches 
certain network load level.

-Maxim