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| H A D | vfs_cluster.c | diff 48545 Sat Jul 03 22:31:17 MDT 1999 mckusick 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> |
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