ocfs2: increase the default size of local alloc windows

I have observed that the current size of 8M gives us pretty poor
fragmentation on multi-threaded workloads which do lots of writes.

Generally, I can increase the size of local alloc windows and observe a
marked decrease in fragmentation, even up and beyond window sizes of 512
megabytes. This makes sense for a couple reasons - larger local alloc means
more room for reservation windows. On multi-node workloads the larger local
alloc helps as well because we don't have to do window slides as often.

Also, I removed the OCFS2_DEFAULT_LOCAL_ALLOC_SIZE constant as it is no
longer used and the comment above it was out of date.

To test fragmentation, I used a workload which launched 4 threads that did
4k writes into a series of about 140 alternating files.

With resv_level=2, and a 4k/4k file system I observed the following average
fragmentation for various localalloc= parameters:

localalloc=	avg. fragmentation
	8		48
	32		16
	64		10
	120		7

On larger cluster sizes, the difference is more dramatic.

The new default size top out at 256M, which we'll only get for cluster
sizes of 32K and above.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 112 insertions, 2 deletions

diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index e39a3e7146c9..00022aac2e8c 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -75,10 +75,120 @@ static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
                                           struct inode *local_alloc_inode);
 
+/*
+ * ocfs2_la_default_mb() - determine a default size, in megabytes of
+ * the local alloc.
+ *
+ * Generally, we'd like to pick as large a local alloc as
+ * possible. Performance on large workloads tends to scale
+ * proportionally to la size. In addition to that, the reservations
+ * code functions more efficiently as it can reserve more windows for
+ * write.
+ *
+ * Some things work against us when trying to choose a large local alloc:
+ *
+ * - We need to ensure our sizing is picked to leave enough space in
+ *   group descriptors for other allocations (such as block groups,
+ *   etc). Picking default sizes which are a multiple of 4 could help
+ *   - block groups are allocated in 2mb and 4mb chunks.
+ *
+ * - Likewise, we don't want to starve other nodes of bits on small
+ *   file systems. This can easily be taken care of by limiting our
+ *   default to a reasonable size (256M) on larger cluster sizes.
+ *
+ * - Some file systems can't support very large sizes - 4k and 8k in
+ *   particular are limited to less than 128 and 256 megabytes respectively.
+ *
+ * The following reference table shows group descriptor and local
+ * alloc maximums at various cluster sizes (4k blocksize)
+ *
+ * csize: 4K    group: 126M     la: 121M
+ * csize: 8K    group: 252M     la: 243M
+ * csize: 16K   group: 504M     la: 486M
+ * csize: 32K   group: 1008M    la: 972M
+ * csize: 64K   group: 2016M    la: 1944M
+ * csize: 128K  group: 4032M    la: 3888M
+ * csize: 256K  group: 8064M    la: 7776M
+ * csize: 512K  group: 16128M   la: 15552M
+ * csize: 1024K group: 32256M   la: 31104M
+ */
+#define OCFS2_LA_MAX_DEFAULT_MB 256
+#define OCFS2_LA_OLD_DEFAULT    8
+unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
+{
+        unsigned int la_mb;
+        unsigned int gd_mb;
+        unsigned int megs_per_slot;
+        struct super_block *sb = osb->sb;
+
+        gd_mb = ocfs2_clusters_to_megabytes(osb->sb,
+                                            8 * ocfs2_group_bitmap_size(sb));
+
+        /*
+         * This takes care of files systems with very small group
+         * descriptors - 512 byte blocksize at cluster sizes lower
+         * than 16K and also 1k blocksize with 4k cluster size.
+         */
+        if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192)
+            || (sb->s_blocksize == 1024 && osb->s_clustersize == 4096))
+                return OCFS2_LA_OLD_DEFAULT;
+
+        /*
+         * Leave enough room for some block groups and make the final
+         * value we work from a multiple of 4.
+         */
+        gd_mb -= 16;
+        gd_mb &= 0xFFFFFFFB;
+
+        la_mb = gd_mb;
+
+        /*
+         * Keep window sizes down to a reasonable default
+         */
+        if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) {
+                /*
+                 * Some clustersize / blocksize combinations will have
+                 * given us a larger than OCFS2_LA_MAX_DEFAULT_MB
+                 * default size, but get poor distribution when
+                 * limited to exactly 256 megabytes.
+                 *
+                 * As an example, 16K clustersize at 4K blocksize
+                 * gives us a cluster group size of 504M. Paring the
+                 * local alloc size down to 256 however, would give us
+                 * only one window and around 200MB left in the
+                 * cluster group. Instead, find the first size below
+                 * 256 which would give us an even distribution.
+                 *
+                 * Larger cluster group sizes actually work out pretty
+                 * well when pared to 256, so we don't have to do this
+                 * for any group that fits more than two
+                 * OCFS2_LA_MAX_DEFAULT_MB windows.
+                 */
+                if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB))
+                        la_mb = 256;
+                else {
+                        unsigned int gd_mult = gd_mb;
+
+                        while (gd_mult > 256)
+                                gd_mult = gd_mult >> 1;
+
+                        la_mb = gd_mult;
+                }
+        }
+
+        megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots;
+        megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot);
+        /* Too many nodes, too few disk clusters. */
+        if (megs_per_slot < la_mb)
+                la_mb = megs_per_slot;
+
+        return la_mb;
+}
+
 void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb)
 {
         struct super_block *sb = osb->sb;
-        unsigned int la_default_mb = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
+        unsigned int la_default_mb = ocfs2_la_default_mb(osb);
         unsigned int la_max_mb;
 
         la_max_mb = ocfs2_clusters_to_megabytes(sb,
@@ -185,7 +295,7 @@ int ocfs2_load_local_alloc(struct ocfs2_super *osb)
                      osb->local_alloc_bits, (osb->bitmap_cpg - 1));
                 osb->local_alloc_bits =
                         ocfs2_megabytes_to_clusters(osb->sb,
-                                                    OCFS2_DEFAULT_LOCAL_ALLOC_SIZE);
+                                                    ocfs2_la_default_mb(osb));
         }
 
         /* read the alloc off disk */