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Set spl_kmem_cache_slab_limit=16384 to default

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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 <behlendorf1@llnl.gov>
Signed-off-by: DHE <git@dehacked.net>
Issue #356
Closes #379
This commit is contained in:
Brian Behlendorf 2014-08-07 16:23:04 -07:00
parent c1aef26944
commit f2297b5a89
1 changed files with 10 additions and 0 deletions
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10
module/spl/spl-kmem.c
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@ -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");