Eric Dumazet says:
====================
net: core: use a dedicated kmem_cache for skb head allocs
Our profile data show that using kmalloc(non_const_size)/kfree(ptr)
has a certain cost, because kfree(ptr) has to pull a 'struct page'
in cpu caches.
Using a dedicated kmem_cache for TCP skb->head allocations makes
a difference, both in cpu cycles and memory savings.
This kmem_cache could also be used for GRO skb allocations,
this is left as a future exercise.
====================
Link: https://lore.kernel.org/r/20230206173103.2617121-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>