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From f5fb626ca74bfed8adb6fd76c247a60a9693e15c Mon Sep 17 00:00:00 2001
From: Jim Somerville <Jim.Somerville@windriver.com>
Date: Thu, 8 Apr 2010 23:44:22 -0700
Subject: [PATCH] nfs: Allow default io size to be configured.
Some boards need a smaller size here for
performance reasons, so let's make the value
configurable for those boards.
Signed-off-by: Jim Somerville <Jim.Somerville@windriver.com>
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index f31fd0dd92c6..4146a61fa3a2 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -39,6 +39,19 @@ config NFS_V2
If unsure, say Y.
+config NFS_DEF_FILE_IO_SIZE
+ int "Default size for NFS I/O read and write at runtime"
+ depends on NFS_FS
+ default "4096"
+ help
+ To change the default rsize and wsize supported by the NFS client,
+ adjust NFS_DEF_FILE_IO_SIZE. 64KB is a typical maximum, but some
+ servers can support a megabyte or more. The default is left at 4096
+ bytes, which is reasonable for NFS over UDP, however, for some
+ systems, setting a smaller value like 1024 can work around
+ limitations in the driver or hardware and result in overall
+ improved performance.
+
config NFS_V3
tristate "NFS client support for NFS version 3"
depends on NFS_FS
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 7cc0deee5bde..c80a4853f4d9 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -11,7 +11,7 @@
* reasonable for NFS over UDP.
*/
#define NFS_MAX_FILE_IO_SIZE (1048576U)
-#define NFS_DEF_FILE_IO_SIZE (4096U)
+#define NFS_DEF_FILE_IO_SIZE CONFIG_NFS_DEF_FILE_IO_SIZE
#define NFS_MIN_FILE_IO_SIZE (1024U)
struct nfs4_string {
--
2.10.1
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