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[TCP]: Avoid a divide in tcp_mtu_probing() 

tcp_mtu_to_mss() being signed, compiler might emit an integer divide
to compute tcp_mtu_to_mss()/2 .

Using a right shift is OK here and less expensive.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2007-12-21 05:58:29 -08:00 committed by David S. Miller
parent 829942c187
commit 8beb5c5f12
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_timer.c
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@ -125,7 +125,7 @@ static void tcp_mtu_probing(struct inet_connection_sock *icsk, struct sock *sk)
struct tcp_sock *tp = tcp_sk(sk);
int mss;
mss = tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low)/2;
mss = tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low) >> 1;
mss = min(sysctl_tcp_base_mss, mss);
mss = max(mss, 68 - tp->tcp_header_len);
icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);