[CIFS] Make cifs default wsize match what we actually want to send (52K (17cbbafe) · Commits · 戴 / test

typically - header + 13 pages). Forgetting to set wsize on the mount command costs more than 10% on large write (can be much more) so this makes a saner default. We still shrink this default smaller if server can not support it. Signed-off-by:

Steve French <sfrench@us.ibm.com>

fs/cifs/connect.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -1785,7 +1785,15 @@ cifs_mount(struct super_block sb, struct cifs_sb_info cifs_sb,
		} else if(volume_info.wsize)
		cifs_sb->wsize = volume_info.wsize;
		else
		cifs_sb->wsize = CIFSMaxBufSize; /* default */
		cifs_sb->wsize =
		min(PAGEVEC_SIZE * PAGE_CACHE_SIZE, 127*1024);
		/* old default of CIFSMaxBufSize was too small now
		that SMB Write2 can send multiple pages in kvec.
		RFC1001 does not describe what happens when frame
		bigger than 128K is sent so use that as max in
		conjunction with 52K kvec constraint on arch with 4K
		page size */

		if(cifs_sb->rsize < PAGE_CACHE_SIZE) {
		cifs_sb->rsize = PAGE_CACHE_SIZE;
		/* Windows ME does this */

Admin message