D-Link DWA-556 atheros wireless card. ath_rx_proc: no mbuf! (fixed)
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The D-Link DWA-556 is a PCIe draft-n wireless card.
I was getting plenty of these across the screen (2010-08-03 2.0 AMD64 snapshot): ath_rx_proc: no mbuf!
Associated with this message were dropped connections and pfsense freezes.
Found this discussion: http://old.nabble.com/kmem_map-too-small-panics-with-Soekris-Atheros-access-point-td25048976.html.
Like described, increased kern.ipc.nmbclusters from 0 to 65536 in /boot/loader.conf and all seems fine now.
Regards,
John