net: sock: fix TCP_SKB_MIN_TRUESIZE
authorEric Dumazet <edumazet@google.com>
Wed, 3 Jul 2013 12:02:22 +0000 (05:02 -0700)
committerDavid S. Miller <davem@davemloft.net>
Wed, 3 Jul 2013 23:52:10 +0000 (16:52 -0700)
commit9eb5bf838d06aa6ddebe4aca6b5cedcf2eb53b86
tree12c3aa5b3242194880829d5b04369c53f087bfc1
parent9caf83c32be1dabf000ab7dc8430fba4f7d89e65
net: sock: fix TCP_SKB_MIN_TRUESIZE

commit eea86af6b1e18d ("net: sock: adapt SOCK_MIN_RCVBUF and
SOCK_MIN_SNDBUF") forgot the sk_buff alignment taken into account
in __alloc_skb() : skb->truesize = SKB_TRUESIZE(size);

While above commit fixed the sender issue, the receiver is still
dropping the second packet (on loopback device), because the receiver
socket can not really hold two skbs :
First packet truesize already is above sk_rcvbuf, so even TCP coalescing
cannot help.

On a typical 64bit build, each tcp skb truesize is 2304, instead of 2272

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Daniel Borkmann <dborkman@redhat.com>
Cc: Neal Cardwell <ncardwell@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Tested-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/sock.h