wired console message w/ boot_verbose

[Rong-En Fan]

Hi,

After upgrading my Feb 10's current to Mar 7, I found there are lots of

15.fff20c879acc0100  2197382500450304 / 16776992 = 130975952    lower
16.0035f47f4c862c80  2238985946529792 / 16778079 = 133447097    lower
15.fff34fee390e5880  2230909964124160 / 16777012 = 132974212    lower
15.fffce3371c8e7900  2468496304766976 / 16777166 = 147134283    lower

messages like this on my console. I think it's probably due to
boot_verbose since I did not see others report about this. Just
wondering who write these messages, and what their meaning?

Thanks,
Rong-En Fan