From 31ff6aa5c86f7564f0dd97c5b3e1404cad238d00 Mon Sep 17 00:00:00 2001 From: Kirill Tkhai Date: Thu, 15 May 2014 19:56:28 +0400 Subject: [PATCH] net: unix: Align send data_len up to PAGE_SIZE Using whole of allocated pages reduces requested skb->data size. This is just a little more thriftily allocation. netperf does not show difference with the current performance. Signed-off-by: Kirill Tkhai Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/unix/af_unix.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index bb7e8ba821f4..7b9114e0a5b1 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1492,10 +1492,14 @@ static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, if (len > sk->sk_sndbuf - 32) goto out; - if (len > SKB_MAX_ALLOC) + if (len > SKB_MAX_ALLOC) { data_len = min_t(size_t, len - SKB_MAX_ALLOC, MAX_SKB_FRAGS * PAGE_SIZE); + data_len = PAGE_ALIGN(data_len); + + BUILD_BUG_ON(SKB_MAX_ALLOC < PAGE_SIZE); + } skb = sock_alloc_send_pskb(sk, len - data_len, data_len, msg->msg_flags & MSG_DONTWAIT, &err, @@ -1670,6 +1674,8 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, data_len = max_t(int, 0, size - SKB_MAX_HEAD(0)); + data_len = min_t(size_t, size, PAGE_ALIGN(data_len)); + skb = sock_alloc_send_pskb(sk, size - data_len, data_len, msg->msg_flags & MSG_DONTWAIT, &err, get_order(UNIX_SKB_FRAGS_SZ)); -- 2.30.2