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authorEric Dumazet <dada1@cosmosbay.com>2007-12-20 21:48:32 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:59:41 -0800
commitb92edbe0b8a36a833c16b0cbafb6e899b81ffc08 (patch)
tree0d5376e9835ebfa06eb9d7f78569c1f1aeb7a301
parent68277accb3a5f004344f4346498640601b8b7016 (diff)
[TCP] Avoid two divides in tcp_output.c
Because 'free_space' variable in __tcp_select_window() is signed, expression (free_space / 2) forces compiler to emit an integer divide. This can be changed to a plain right shift, less expensive. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/tcp_output.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 7c50271ddc3..9a9510acb14 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1627,7 +1627,7 @@ u32 __tcp_select_window(struct sock *sk)
if (mss > full_space)
mss = full_space;
- if (free_space < full_space/2) {
+ if (free_space < (full_space >> 1)) {
icsk->icsk_ack.quick = 0;
if (tcp_memory_pressure)
@@ -1666,7 +1666,7 @@ u32 __tcp_select_window(struct sock *sk)
if (window <= free_space - mss || window > free_space)
window = (free_space/mss)*mss;
else if (mss == full_space &&
- free_space > window + full_space/2)
+ free_space > window + (full_space >> 1))
window = free_space;
}