From 2a3a041c4e2c1685e668b280c121a5a40a029a03 Mon Sep 17 00:00:00 2001 From: Ilpo Järvinen Date: Sat, 14 Mar 2009 22:45:16 +0000 Subject: tcp: cache result of earlier divides when mss-aligning things The results is very unlikely change every so often so we hardly need to divide again after doing that once for a connection. Yet, if divide still becomes necessary we detect that and do the right thing and again settle for non-divide state. Takes the u16 space which was previously taken by the plain xmit_size_goal. This should take care part of the tso vs non-tso difference we found earlier. Signed-off-by: Ilpo Järvinen Signed-off-by: David S. Miller --- net/ipv4/tcp.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 886596ff0aae..0db9f3b984f7 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -665,7 +665,7 @@ static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now, int large_allowed) { struct tcp_sock *tp = tcp_sk(sk); - u32 xmit_size_goal; + u32 xmit_size_goal, old_size_goal; xmit_size_goal = mss_now; @@ -676,7 +676,17 @@ static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now, tp->tcp_header_len); xmit_size_goal = tcp_bound_to_half_wnd(tp, xmit_size_goal); - xmit_size_goal -= (xmit_size_goal % mss_now); + + /* We try hard to avoid divides here */ + old_size_goal = tp->xmit_size_goal_segs * mss_now; + + if (likely(old_size_goal <= xmit_size_goal && + old_size_goal + mss_now > xmit_size_goal)) { + xmit_size_goal = old_size_goal; + } else { + tp->xmit_size_goal_segs = xmit_size_goal / mss_now; + xmit_size_goal = tp->xmit_size_goal_segs * mss_now; + } } return xmit_size_goal; -- cgit v1.2.3-55-g7522