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/freebsd-9.3-release/sbin/fsck_ffs/
H A Dfsutil.cdiff 129401 Tue May 18 17:51:41 MDT 2004 scottl Improve the delay algorithm used in bgfsck. From the author:

shuffles the timing and sleep calls in bgfsck from:

sleep timer_on io timer_off io io io io io io io
to
sleep io io io io io io io timer_on io timer_off

The original method basically guaranteed that the timed I/O included a
disk seek every time, which made bgfsck sleep for much longer than
necessary.

Submitted by: Dan Nelson
Reviewed by: kirk

Completed in 94 milliseconds