Commit e8506d25 authored by Steve French's avatar Steve French
Browse files

smb3: make default i/o size for smb3 mounts larger 



We negotiate rsize mounts (and it can be overridden by user) to
typically 4MB, so using larger default I/O sizes from userspace
(changing to 1MB default i/o size returned by stat) the
performance is much better (and not just for long latency
network connections) in most use cases for SMB3 than the default I/O
size (which ends up being 128K for cp and can be even smaller for cp).
This can be 4x slower or worse depending on network latency.

By changing inode->blocksize from 32K (which was perhaps ok
for very old SMB1/CIFS) to a larger value, 1MB (but still less than
max size negotiated with the server which is 4MB, in order to minimize
risk) it significantly increases performance for the
noncached case, and slightly increases it for the cached case.
This can be changed by the user on mount (specifying bsize=
values from 16K to 16MB) to tune better for performance
for applications that depend on blocksize.

Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
Reviewed-by: default avatarRonnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>
parent 7b9b9edb

fs/cifs/cifs_fs_sb.h

+1 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ struct cifs_sb_info { 
	spinlock_t tlink_tree_lock;

	struct tcon_link *master_tlink;

	struct nls_table *local_nls;

	unsigned int bsize;

	unsigned int rsize;

	unsigned int wsize;

	unsigned long actimeo; /* attribute cache timeout (jiffies) */

fs/cifs/cifsfs.c

+1 −0
Original line number Diff line number Diff line
@@ -554,6 +554,7 @@ cifs_show_options(struct seq_file *s, struct dentry *root) 


	seq_printf(s, ",rsize=%u", cifs_sb->rsize);

	seq_printf(s, ",wsize=%u", cifs_sb->wsize);

	seq_printf(s, ",bsize=%u", cifs_sb->bsize);

	seq_printf(s, ",echo_interval=%lu",

			tcon->ses->server->echo_interval / HZ);

	if (tcon->snapshot_time)

fs/cifs/cifsglob.h

+1 −0
Original line number Diff line number Diff line
@@ -557,6 +557,7 @@ struct smb_vol { 
	bool resilient:1; /* noresilient not required since not fored for CA */

	bool domainauto:1;

	bool rdma:1;

	unsigned int bsize;

	unsigned int rsize;

	unsigned int wsize;

	bool sockopt_tcp_nodelay:1;

fs/cifs/connect.c

+24 −2
Original line number Diff line number Diff line
@@ -102,7 +102,7 @@ enum { 
	Opt_backupuid, Opt_backupgid, Opt_uid,

	Opt_cruid, Opt_gid, Opt_file_mode,

	Opt_dirmode, Opt_port,

	Opt_rsize, Opt_wsize, Opt_actimeo,

	Opt_blocksize, Opt_rsize, Opt_wsize, Opt_actimeo,

	Opt_echo_interval, Opt_max_credits,

	Opt_snapshot,
@@ -204,6 +204,7 @@ static const match_table_t cifs_mount_option_tokens = { 
	{ Opt_dirmode, "dirmode=%s" },

	{ Opt_dirmode, "dir_mode=%s" },

	{ Opt_port, "port=%s" },

	{ Opt_blocksize, "bsize=%s" },

	{ Opt_rsize, "rsize=%s" },

	{ Opt_wsize, "wsize=%s" },

	{ Opt_actimeo, "actimeo=%s" },
@@ -1598,7 +1599,7 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, 
	vol->cred_uid = current_uid();

	vol->linux_uid = current_uid();

	vol->linux_gid = current_gid();



	vol->bsize = 1024 * 1024; /* can improve cp performance significantly */

	/*

	 * default to SFM style remapping of seven reserved characters

	 * unless user overrides it or we negotiate CIFS POSIX where
@@ -1971,6 +1972,26 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, 
			}

			port = (unsigned short)option;

			break;

		case Opt_blocksize:

			if (get_option_ul(args, &option)) {

				cifs_dbg(VFS, "%s: Invalid blocksize value\n",

					__func__);

				goto cifs_parse_mount_err;

			}

			/*

			 * inode blocksize realistically should never need to be

			 * less than 16K or greater than 16M and default is 1MB.

			 * Note that small inode block sizes (e.g. 64K) can lead

			 * to very poor performance of common tools like cp and scp

			 */

			if ((option < CIFS_MAX_MSGSIZE) ||

			   (option > (4 * SMB3_DEFAULT_IOSIZE))) {

				cifs_dbg(VFS, "%s: Invalid blocksize\n",

					__func__);

				goto cifs_parse_mount_err;

			}

			vol->bsize = option;

			break;

		case Opt_rsize:

			if (get_option_ul(args, &option)) {

				cifs_dbg(VFS, "%s: Invalid rsize value\n",
@@ -3866,6 +3887,7 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info, 
	spin_lock_init(&cifs_sb->tlink_tree_lock);

	cifs_sb->tlink_tree = RB_ROOT;



	cifs_sb->bsize = pvolume_info->bsize;

	/*

	 * Temporarily set r/wsize for matching superblock. If we end up using

	 * new sb then client will later negotiate it downward if needed.

fs/cifs/inode.c

+1 −1
Original line number Diff line number Diff line
@@ -2080,7 +2080,7 @@ int cifs_getattr(const struct path *path, struct kstat *stat, 
		return rc;



	generic_fillattr(inode, stat);

	stat->blksize = CIFS_MAX_MSGSIZE;

	stat->blksize = cifs_sb->bsize;

	stat->ino = CIFS_I(inode)->uniqueid;



	/* old CIFS Unix Extensions doesn't return create time */

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