[PATCH -v2 6/6] fuse: add documentation of sysfs parameter to limitmaximum fuse request size

From: Mitsuo Hayasaka
Date: Thu Jul 19 2012 - 08:43:01 EST

Add an explanation about the sysfs parameter to limit the
maximum read/write request size.

Signed-off-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@xxxxxxxxxxx>
Cc: Rob Landley <rob@xxxxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Nikolaus Rath <Nikolaus@xxxxxxxx>
Cc: Liu Yuan <namei.unix@xxxxxxxxx>
Cc: Has-Wen Nienhuys <hanwen@xxxxxxxxx>

Documentation/filesystems/fuse.txt | 15 ++++++++++++++-
1 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/Documentation/filesystems/fuse.txt b/Documentation/filesystems/fuse.txt
index 13af4a4..4e706ec 100644
--- a/Documentation/filesystems/fuse.txt
+++ b/Documentation/filesystems/fuse.txt
@@ -108,13 +108,26 @@ Mount options

With this option the maximum size of read operations can be set.
The default is infinite. Note that the size of read requests is
- limited anyway to 32 pages (which is 128kbyte on i386).
+ limited by max_pages_per_req sysfs parameter (See below for details.)


Set the block size for the filesystem. The default is 512. This
option is only valid for 'fuseblk' type mounts.

+Sysfs parameter
+ '/sys/fs/fuse/max_pages_per_req'
+Specify max request size in pages, which limits max_read/max_write
+mount option. The default is 32 pages (which is 128kbyte on i386).
+It can be changed to arbitrary number between 32 and the number of
+pages equivalent to pipe_max_size.
+Changing it may improve read/write throughput on systems. Existing
+FUSE mount must be remounted for this change to take effect.
Control filesystem

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