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>
diff --git a/net/core/sock.c b/net/core/sock.c
index 654e38a..e891bcf 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2799,8 +2799,7 @@
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;