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| author | Chuck Lever <cel@netapp.com> | 2005-11-30 18:09:02 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-01-06 14:58:49 -0500 |
| commit | 40859d7ee64ed6bfad8a4e93f9bb5c1074afadff (patch) | |
| tree | ed4069423c3d6551035d5b6116f50452cdac4103 /fs/nfs/direct.c | |
| parent | 325cfed9ae901320e9234b18c21434b783dbe342 (diff) | |
| download | lwn-40859d7ee64ed6bfad8a4e93f9bb5c1074afadff.tar.gz lwn-40859d7ee64ed6bfad8a4e93f9bb5c1074afadff.zip | |
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>
Diffstat (limited to 'fs/nfs/direct.c')
| -rw-r--r-- | fs/nfs/direct.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index f69d95aa78b2..fd7ac5e841c1 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -154,6 +154,7 @@ static struct nfs_direct_req *nfs_direct_read_alloc(size_t nbytes, unsigned int struct list_head *list; struct nfs_direct_req *dreq; unsigned int reads = 0; + unsigned int rpages = (rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; dreq = kmem_cache_alloc(nfs_direct_cachep, SLAB_KERNEL); if (!dreq) @@ -167,7 +168,7 @@ static struct nfs_direct_req *nfs_direct_read_alloc(size_t nbytes, unsigned int list = &dreq->list; for(;;) { - struct nfs_read_data *data = nfs_readdata_alloc(); + struct nfs_read_data *data = nfs_readdata_alloc(rpages); if (unlikely(!data)) { while (!list_empty(list)) { @@ -431,7 +432,7 @@ static ssize_t nfs_direct_write_seg(struct inode *inode, struct nfs_writeverf first_verf; struct nfs_write_data *wdata; - wdata = nfs_writedata_alloc(); + wdata = nfs_writedata_alloc(NFS_SERVER(inode)->wpages); if (!wdata) return -ENOMEM; |