From: Yafang Shao <laoar.shao@gmail.com>
To: davem@davemloft.net, edumazet@google.com
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Yafang Shao <laoar.shao@gmail.com>, Joe Perches <joe@perches.com>
Subject: [PATCH net-next] tcp: minor optimization in tcp ack fast path processing
Date: Wed, 7 Nov 2018 19:20:17 +0800 [thread overview]
Message-ID: <1541589617-1607-2-git-send-email-laoar.shao@gmail.com> (raw)
In-Reply-To: <1541589617-1607-1-git-send-email-laoar.shao@gmail.com>
Bitwise operation is a little faster.
So I replace after() with (flag & FLAG_SND_UNA_ADVANCED) as this flag is
already set before.
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
net/ipv4/tcp_input.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2868ef2..0167015 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3610,7 +3610,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
if (flag & FLAG_UPDATE_TS_RECENT)
tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq);
- if (!(flag & FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
+ if (!(flag & FLAG_SLOWPATH) && (flag & FLAG_SND_UNA_ADVANCED)) {
/* Window is constant, pure forward advance.
* No more checks are required.
* Note, we use the fact that SND.UNA>=SND.WL2.
--
1.8.3.1
next prev parent reply other threads:[~2018-11-07 11:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-07 11:20 [PATCH net-next] inet: minor optimization for backlog setting in listen(2) Yafang Shao
2018-11-07 11:20 ` Yafang Shao [this message]
2018-11-07 15:16 ` [PATCH net-next] tcp: minor optimization in tcp ack fast path processing Eric Dumazet
2018-11-08 1:45 ` Yafang Shao
2018-11-07 18:03 ` [PATCH net-next] inet: minor optimization for backlog setting in listen(2) Eric Dumazet
2018-11-08 6:31 ` David Miller
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