Set spl_kmem_cache_slab_limit=16384 to default

[mirror_spl.git] / module / spl / spl-kmem.c

diff --git a/module/spl/spl-kmem.c b/module/spl/spl-kmem.c
index 0d1da437865e1aa47392c2e91d6709b9ff0c82fb..0a9d77534df2785463aa27c165ff4a08cfb4d2c2 100644 (file)
--- a/module/spl/spl-kmem.c
+++ b/module/spl/spl-kmem.c
@@ -81,7 +81,17 @@ unsigned int spl_kmem_cache_max_size = 32;
 module_param(spl_kmem_cache_max_size, uint, 0644);
 MODULE_PARM_DESC(spl_kmem_cache_max_size, "Maximum size of slab in MB");
 
+/*
+ * For small objects the Linux slab allocator should be used to make the most
+ * efficient use of the memory.  However, large objects are not supported by
+ * the Linux slab and therefore the SPL implementation is preferred.  A cutoff
+ * of 16K was determined to be optimal for architectures using 4K pages.
+ */
+#if PAGE_SIZE == 4096
+unsigned int spl_kmem_cache_slab_limit = 16384;
+#else
 unsigned int spl_kmem_cache_slab_limit = 0;
+#endif
 module_param(spl_kmem_cache_slab_limit, uint, 0644);
 MODULE_PARM_DESC(spl_kmem_cache_slab_limit,
     "Objects less than N bytes use the Linux slab");