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>

1 files changed, 1 insertions, 2 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index 654e38a99759..e891bcf325ca 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2799,8 +2799,7 @@ 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,
+                                                  prot->slab_flags,
                                                   NULL);
                         if (prot->twsk_prot->twsk_slab == NULL)
                                 goto out_free_timewait_sock_slab_name;