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tcp: tcp_sendmsg() page recycling

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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 <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-12-04 07:05:17 +00:00 committed by David S. Miller
parent 117632e64d
commit 761965eab3
1 changed files with 6 additions and 1 deletions
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7
net/ipv4/tcp.c
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@ -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) {