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From: Andreas Schwarz <freebsd.asc@strcmp.org>
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Subject: Re: smsc0 driver on rpi2
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On 21.05.15, Andreas Andersson wrote:

> smsc0: warning: MII is busy
> smsc0: warning: Failed to read register 0x114
> smsc0: warning: MII read timeout
> smsc0: warning: Failed to read register 0x114
> smsc0: warning: MII is busy
>
> This happends when the rpi2 has been turned on for some while. And the
> raspberry becomes pretty slow and laggy when this error occurs. CPU when
> looking at top is pretty much idle across all cores, but load averages
> are: 7:23AM  up 13:51, 5 users, load averages: 3.70, 3.37, 3.24

Seems that I'm running into the same problem with one of my rpi2 (r283859). 
It will occur when having high IO, typically when building the world. I'm 
also running a rpi2 with older r283161, which is not affected.

-asc