diff options
| author |   stephen hemminger <shemminger@vyatta.com> | 2011-03-14 07:52:13 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2011-03-14 15:54:38 -0700 |
| commit | c54b4b7655447c1f24f6d50779c22eba9ee0fd24 (patch) | |
| tree | 42178e794fafe36de1a00607b28363e1fe8da3f2 /net/ipv4/tcp_cubic.c | |
| parent | tcp: fix RTT for quick packets in congestion control (diff) | |
| download | linux-dev-c54b4b7655447c1f24f6d50779c22eba9ee0fd24.tar.xz linux-dev-c54b4b7655447c1f24f6d50779c22eba9ee0fd24.zip | |
tcp_cubic: fix comparison of jiffies
Jiffies wraps around therefore the correct way to compare is
to use cast to signed value.
Note: cubic is not using full jiffies value on 64 bit arch
because using full unsigned long makes struct bictcp grow too
large for the available ca_priv area.
Includes correction from Sangtae Ha to improve ack train detection.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_cubic.c')
| -rw-r--r-- | net/ipv4/tcp_cubic.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c index 71d5f2f29fa6..43bb34c9b8bf 100644 --- a/net/ipv4/tcp_cubic.c +++ b/net/ipv4/tcp_cubic.c @@ -342,9 +342,11 @@ static void hystart_update(struct sock *sk, u32 delay) u32 curr_jiffies = jiffies; /* first detection parameter - ack-train detection */ - if (curr_jiffies - ca->last_jiffies <= msecs_to_jiffies(2)) { + if ((s32)(curr_jiffies - ca->last_jiffies) <= + msecs_to_jiffies(2)) { ca->last_jiffies = curr_jiffies; - if (curr_jiffies - ca->round_start >= ca->delay_min>>4) + if ((s32) (curr_jiffies - ca->round_start) > + ca->delay_min >> 4) ca->found |= HYSTART_ACK_TRAIN; } |