Commit b92edbe0 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

[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: default avatarEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 68277acc
......@@ -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;
}
......
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