diff options
| author | Brian Behlendorf <[email protected]> | 2014-08-07 16:23:04 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2014-08-08 08:51:45 -0700 |
| commit | f2297b5a8932594a45c99d3d01b0d53a16ea9753 (patch) | |
| tree | ad50b150984912e3b838e9b9d9ceebdb1302a3cd | |
| parent | c1aef26944ca8bc18e9f46f464c2957890c707e9 (diff) | |
Set spl_kmem_cache_slab_limit=16384 to default
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.
Signed-off-by: Brian Behlendorf <[email protected]>
Signed-off-by: DHE <[email protected]>
Issue #356
Closes #379
| -rw-r--r-- | module/spl/spl-kmem.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/module/spl/spl-kmem.c b/module/spl/spl-kmem.c index 0d1da4378..0a9d77534 100644 --- 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"); |