K 10
svn:author
V 8
mckusick
K 8
svn:date
V 27
1999-07-04T00:31:17.000000Z
K 7
svn:log
V 862
The vfs.write_behind sysctl and related code support has been added to
allow changes to the filesystem's write_behind behavior.  By the
default the filesystem aggressively issues write_behind's.  Three values
may be specified for vfs.write_behind.  0 disables write_behind, 1 results
in historical operation (agressive write_behind), and 2 is an experimental
backed-off write_behind.  The values of 0 and 1 are recommended.  The value
of 0 is recommended in conjuction with an increase in the number of
NBUF's and the number of dirty buffers allowed (vfs.{lo,hi}dirtybuffers).
Note that a value of 0 will radically increase the dirty buffer load on
the system.  Future work on write_behind behavior will use values 2 and
greater for testing purposes.

Submitted by:	Matthew Dillon <dillon@apollo.backplane.com>
Reviewed by:	Kirk McKusick <mckusick@mckusick.com>

END