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NFS: support large reads and writes on the wire

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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>
This commit is contained in:
Chuck Lever
2005-11-30 18:09:02 -05:00
committed by Trond Myklebust
parent 325cfed9ae
commit 40859d7ee6
8 changed files with 91 additions and 53 deletions
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29
fs/nfs/write.c
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@ -89,18 +89,33 @@ static mempool_t *nfs_commit_mempool;
static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion);
static inline struct nfs_write_data *nfs_commit_alloc(void)
static inline struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount)
{
struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_NOFS);
if (p) {
memset(p, 0, sizeof(*p));
INIT_LIST_HEAD(&p->pages);
if (pagecount < NFS_PAGEVEC_SIZE)
p->pagevec = &p->page_array[0];
else {
size_t size = ++pagecount * sizeof(struct page *);
p->pagevec = kmalloc(size, GFP_NOFS);
if (p->pagevec) {
memset(p->pagevec, 0, size);
} else {
mempool_free(p, nfs_commit_mempool);
p = NULL;
}
}
}
return p;
}
static inline void nfs_commit_free(struct nfs_write_data *p)
{
if (p && (p->pagevec != &p->page_array[0]))
kfree(p->pagevec);
mempool_free(p, nfs_commit_mempool);
}
@ -167,7 +182,7 @@ static int nfs_writepage_sync(struct nfs_open_context *ctx, struct inode *inode,
int result, written = 0;
struct nfs_write_data *wdata;
wdata = nfs_writedata_alloc();
wdata = nfs_writedata_alloc(1);
if (!wdata)
return -ENOMEM;
@ -909,7 +924,7 @@ static int nfs_flush_multi(struct list_head *head, struct inode *inode, int how)
nbytes = req->wb_bytes;
for (;;) {
data = nfs_writedata_alloc();
data = nfs_writedata_alloc(1);
if (!data)
goto out_bad;
list_add(&data->pages, &list);
@ -973,7 +988,7 @@ static int nfs_flush_one(struct list_head *head, struct inode *inode, int how)
if (NFS_SERVER(inode)->wsize < PAGE_CACHE_SIZE)
return nfs_flush_multi(head, inode, how);
data = nfs_writedata_alloc();
data = nfs_writedata_alloc(NFS_SERVER(inode)->wpages);
if (!data)
goto out_bad;
@ -1241,12 +1256,12 @@ static void nfs_commit_rpcsetup(struct list_head *head,
* Commit dirty pages
*/
static int
nfs_commit_list(struct list_head *head, int how)
nfs_commit_list(struct inode *inode, struct list_head *head, int how)
{
struct nfs_write_data *data;
struct nfs_page *req;
data = nfs_commit_alloc();
data = nfs_commit_alloc(NFS_SERVER(inode)->wpages);
if (!data)
goto out_bad;
@ -1351,7 +1366,7 @@ int nfs_commit_inode(struct inode *inode, int how)
res = nfs_scan_commit(inode, &head, 0, 0);
spin_unlock(&nfsi->req_lock);
if (res) {
error = nfs_commit_list(&head, how);
error = nfs_commit_list(inode, &head, how);
if (error < 0)
return error;
}