Sudden mbuf demand increase and shortage under the load

[Maxim Sobolev]

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