From b92edbe0b8a36a833c16b0cbafb6e899b81ffc08 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 20 Dec 2007 21:48:32 -0800 Subject: [PATCH] [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 Signed-off-by: David S. Miller --- net/ipv4/tcp_output.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 7c50271ddc30..9a9510acb147 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; } -- 2.20.1