NFS: support large reads and writes on the wire

 Most NFS server implementations allow up to 64KB reads and writes on the
 wire.  The Solaris NFS server allows up to a megabyte, for instance.

 Now the Linux NFS client supports transfer sizes up to 1MB, too.  This will
 help reduce protocol and context switch overhead on read/write intensive NFS
 workloads, and support larger atomic read and write operations on servers
 that support them.

 Test-plan:
 Connectathon and iozone on mount point with wsize=rsize>32768 over TCP.
 Tests with NFS over UDP to verify the maximum RPC payload size cap.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index 1b272a135a31..985cc53b8dd5 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -296,8 +296,8 @@ static int __init root_nfs_name(char *name)
         nfs_port          = -1;
         nfs_data.version  = NFS_MOUNT_VERSION;
         nfs_data.flags    = NFS_MOUNT_NONLM;    /* No lockd in nfs root yet */
-        nfs_data.rsize    = NFS_DEF_FILE_IO_BUFFER_SIZE;
-        nfs_data.wsize    = NFS_DEF_FILE_IO_BUFFER_SIZE;
+        nfs_data.rsize    = NFS_DEF_FILE_IO_SIZE;
+        nfs_data.wsize    = NFS_DEF_FILE_IO_SIZE;
         nfs_data.acregmin = 3;
         nfs_data.acregmax = 60;
         nfs_data.acdirmin = 30;