linux-kernel - [PATCH -v2 6/6] fuse: add documentation of sysfs parameter to limit maximum fuse request size

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Message-ID: <20120719125007.6250.29754.stgit@ltc137.sdl.hitachi.co.jp>
Date:	Thu, 19 Jul 2012 21:50:08 +0900
From:	Mitsuo Hayasaka <mitsuo.hayasaka.hu@...achi.com>
To:	Miklos Szeredi <miklos@...redi.hu>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Muthukumar R <muthur@...il.com>
Cc:	fuse-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
	yrl.pp-manager.tt@...achi.com,
	Mitsuo Hayasaka <mitsuo.hayasaka.hu@...achi.com>,
	Rob Landley <rob@...dley.net>,
	Miklos Szeredi <miklos@...redi.hu>,
	Nikolaus Rath <Nikolaus@...h.org>,
	Liu Yuan <namei.unix@...il.com>,
	Has-Wen Nienhuys <hanwen@...all.nl>
Subject: [PATCH -v2 6/6] fuse: add documentation of sysfs parameter to limit
 maximum fuse request size

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

Signed-off-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@...achi.com>
Cc: Rob Landley <rob@...dley.net>
Cc: Miklos Szeredi <miklos@...redi.hu>
Cc: Nikolaus Rath <Nikolaus@...h.org>
Cc: Liu Yuan <namei.unix@...il.com>
Cc: Has-Wen Nienhuys <hanwen@...all.nl>
---

 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.)
 
 'blksize=N'
 
   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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