Commit 52db70dc authored Apr 10, 2015 by Eric Dumazet Committed by David S. Miller Apr 12, 2015

tcp: do not cache align timewait sockets



With recent adoption of skc_cookie in struct sock_common,
struct tcp_timewait_sock size increased from 192 to 200 bytes
on 64bit arches. SLAB rounds then to 256 bytes.

It is time to drop SLAB_HWCACHE_ALIGN constraint for twsk_slab.

This saves about 12 MB of memory on typical configuration reaching
262144 timewait sockets, and has no noticeable impact on performance.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 4e78eb0d

net/core/sock.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -2799,7 +2799,6 @@ int proto_register(struct proto *prot, int alloc_slab)
		kmem_cache_create(prot->twsk_prot->twsk_slab_name,
		prot->twsk_prot->twsk_obj_size,
		0,
		SLAB_HWCACHE_ALIGN \|
		prot->slab_flags,
		NULL);
		if (prot->twsk_prot->twsk_slab == NULL)