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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-12-04 07:05:17 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-12-04 13:20:40 -0500 |
| commit | 761965eab38d2cbc59c36e355c59609e3a04705a (patch) | |
| tree | 53bc45ee752f8d31323962e5af2e0451376c3b35 /net/ipv4/tcp.c | |
| parent | 117632e64d2a5f464e491fe221d7169a3814a77b (diff) | |
| download | lwn-761965eab38d2cbc59c36e355c59609e3a04705a.tar.gz lwn-761965eab38d2cbc59c36e355c59609e3a04705a.zip | |
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 <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 45156be3abfd..a09fe253b917 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) { |