From 761965eab38d2cbc59c36e355c59609e3a04705a Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sun, 4 Dec 2011 07:05:17 +0000 Subject: tcp: tcp_sendmsg() page recycling If our TCP_PAGE(sk) is not shared (page_count() == 1), we can set page offset to 0. This permits better filling of the pages on small to medium tcp writes. "tbench 16" results on my dev server (2x4x2 machine) : Before : 3072 MB/s After : 3146 MB/s (2.4 % gain) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/tcp.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'net/ipv4') diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 45156be3abf..a09fe253b91 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1009,7 +1009,12 @@ new_segment: int merge = 0; int i = skb_shinfo(skb)->nr_frags; struct page *page = TCP_PAGE(sk); - int off = TCP_OFF(sk); + int off; + + if (page && page_count(page) == 1) + TCP_OFF(sk) = 0; + + off = TCP_OFF(sk); if (skb_can_coalesce(skb, i, page, off) && off != PAGE_SIZE) { -- cgit v1.2.3-70-g09d2