9p: set readahead and io size according to maxsize

having a readahead of 128k with a msize of 128k (with overhead) lead to reading 124+4k everytime, making two roundtrips needlessly. tune readahead according to msize when cache is enabled for better performance Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Dominique Martinet <[email protected]>
grate-driver · Nov 4, 2021 · b1843d2 · b1843d2
1 parent 05f975c
commit b1843d2
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
@@ -79,6 +79,9 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
 	if (!v9ses->cache) {
 		sb->s_bdi->ra_pages = 0;
 		sb->s_bdi->io_pages = 0;
+	} else {
+		sb->s_bdi->ra_pages = v9ses->maxdata >> PAGE_SHIFT;
+		sb->s_bdi->io_pages = v9ses->maxdata >> PAGE_SHIFT;
 	}
 
 	sb->s_flags |= SB_ACTIVE | SB_DIRSYNC;