diff options
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/skbuff.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 33fdf04d4334..9b5bc621daf7 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4795,12 +4795,23 @@ static void skb_extensions_init(void) static void skb_extensions_init(void) {} #endif +/* The SKB kmem_cache slab is critical for network performance. Never + * merge/alias the slab with similar sized objects. This avoids fragmentation + * that hurts performance of kmem_cache_{alloc,free}_bulk APIs. + */ +#ifndef CONFIG_SLUB_TINY +#define FLAG_SKB_NO_MERGE SLAB_NO_MERGE +#else /* CONFIG_SLUB_TINY - simple loop in kmem_cache_alloc_bulk */ +#define FLAG_SKB_NO_MERGE 0 +#endif + void __init skb_init(void) { skbuff_cache = kmem_cache_create_usercopy("skbuff_head_cache", sizeof(struct sk_buff), 0, - SLAB_HWCACHE_ALIGN|SLAB_PANIC, + SLAB_HWCACHE_ALIGN|SLAB_PANIC| + FLAG_SKB_NO_MERGE, offsetof(struct sk_buff, cb), sizeof_field(struct sk_buff, cb), NULL); |