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authorEric Van Hensbergen <ericvh@gmail.com>2007-02-11 14:21:39 -0500
committerEric Van Hensbergen <ericvh@gmail.com>2007-02-18 11:16:10 -0500
commite03abc0c963a31cb07dfbc07c7d85d75e0d13cf4 (patch)
tree1840001bde4a7f9f01d39dd09baf7d7b04e95706 /Documentation/filesystems/9p.txt
parent2c0463a9ae8751547c39302aeb31c6cef16b5df4 (diff)
9p: implement optional loose read cache
While cacheing is generally frowned upon in the 9p world, it has its place -- particularly in situations where the remote file system is exclusive and/or read-only. The vacfs views of venti content addressable store are a real-world instance of such a situation. To facilitate higher performance for these workloads (and eventually use the fscache patches), we have enabled a "loose" cache mode which does not attempt to maintain any form of consistency on the page-cache or dcache. This results in over two orders of magnitude performance improvement for cacheable block reads in the Bonnie benchmark. The more aggressive use of the dcache also seems to improve metadata operational performance. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'Documentation/filesystems/9p.txt')
-rw-r--r--Documentation/filesystems/9p.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/filesystems/9p.txt b/Documentation/filesystems/9p.txt
index 4d075a4558f9..bbd8b28c13de 100644
--- a/Documentation/filesystems/9p.txt
+++ b/Documentation/filesystems/9p.txt
@@ -40,6 +40,10 @@ OPTIONS
40 aname=name aname specifies the file tree to access when the server is 40 aname=name aname specifies the file tree to access when the server is
41 offering several exported file systems. 41 offering several exported file systems.
42 42
43 cache=mode specifies a cacheing policy. By default, no caches are used.
44 loose = no attempts are made at consistency,
45 intended for exclusive, read-only mounts
46
43 debug=n specifies debug level. The debug level is a bitmask. 47 debug=n specifies debug level. The debug level is a bitmask.
44 0x01 = display verbose error messages 48 0x01 = display verbose error messages
45 0x02 = developer debug (DEBUG_CURRENT) 49 0x02 = developer debug (DEBUG_CURRENT)