diff options
| author | John Heffner <jheffner@psc.edu> | 2006-05-06 02:41:44 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-05-06 02:41:44 +0200 |
| commit | 5528e568a760442e0ec8fd2dea1f0791875a066b (patch) | |
| tree | 726a177e2e623294a4514e9423912395dee90199 /net/ipv4 | |
| parent | [NETROM/ROSE]: Kill module init version kernel log messages. (diff) | |
| download | linux-5528e568a760442e0ec8fd2dea1f0791875a066b.tar.xz linux-5528e568a760442e0ec8fd2dea1f0791875a066b.zip | |
[TCP]: Fix snd_cwnd adjustments in tcp_highspeed.c
Xiaoliang (David) Wei wrote:
> Hi gurus,
>
> I am reading the code of tcp_highspeed.c in the kernel and have a
> question on the hstcp_cong_avoid function, specifically the following
> AI part (line 136~143 in net/ipv4/tcp_highspeed.c ):
>
> /* Do additive increase */
> if (tp->snd_cwnd < tp->snd_cwnd_clamp) {
> tp->snd_cwnd_cnt += ca->ai;
> if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
> tp->snd_cwnd++;
> tp->snd_cwnd_cnt -= tp->snd_cwnd;
> }
> }
>
> In this part, when (tp->snd_cwnd_cnt == tp->snd_cwnd),
> snd_cwnd_cnt will be -1... snd_cwnd_cnt is defined as u16, will this
> small chance of getting -1 becomes a problem?
> Shall we change it by reversing the order of the cwnd++ and cwnd_cnt -=
> cwnd?
Absolutely correct. Thanks.
Signed-off-by: John Heffner <jheffner@psc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_highspeed.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_highspeed.c b/net/ipv4/tcp_highspeed.c index e0e9d1383c7c..b72fa55dfb84 100644 --- a/net/ipv4/tcp_highspeed.c +++ b/net/ipv4/tcp_highspeed.c @@ -137,8 +137,8 @@ static void hstcp_cong_avoid(struct sock *sk, u32 adk, u32 rtt, if (tp->snd_cwnd < tp->snd_cwnd_clamp) { tp->snd_cwnd_cnt += ca->ai; if (tp->snd_cwnd_cnt >= tp->snd_cwnd) { - tp->snd_cwnd++; tp->snd_cwnd_cnt -= tp->snd_cwnd; + tp->snd_cwnd++; } } } |