2 users    Load 0.09 0.09 0.08                     Thu Jun  2 20:12:59 2011

DEVICE             READ    WRITE     RTPS     WTPS      SEC                STATS
sd0                   0        0        0        0      0.0         588656 
numbufs
sd1                   0        0        0        0      0.0         588656 
freebufs
Totals                0        0        0        0      0.0        1057774 
numbufpages

It's a sparc64, so that is just over 8GB of data stored in the buffer
cache, all of it dma-reachable in case I decide to write to it
(because of the iommu).

This will come one day soon to 32-bit dma machines as well, using
the buf flip.

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