diff options
Diffstat (limited to 'net/ipv4/tcp_yeah.c')
| -rw-r--r-- | net/ipv4/tcp_yeah.c | 42 |
1 files changed, 23 insertions, 19 deletions
diff --git a/net/ipv4/tcp_yeah.c b/net/ipv4/tcp_yeah.c index 18355a2608e..46dd1bee583 100644 --- a/net/ipv4/tcp_yeah.c +++ b/net/ipv4/tcp_yeah.c @@ -74,7 +74,7 @@ static void tcp_yeah_pkts_acked(struct sock *sk, u32 pkts_acked) } static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack, - u32 seq_rtt, u32 in_flight, int flag) + u32 seq_rtt, u32 in_flight, int flag) { struct tcp_sock *tp = tcp_sk(sk); struct yeah *yeah = inet_csk_ca(sk); @@ -142,8 +142,8 @@ static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack, */ if (yeah->cntRTT > 2) { - u32 rtt; - u32 queue, maxqueue; + u32 rtt, queue; + u64 bw; /* We have enough RTT samples, so, using the Vegas * algorithm, we determine if we should increase or @@ -158,32 +158,36 @@ static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack, */ rtt = yeah->minRTT; - queue = (u32)div64_64((u64)tp->snd_cwnd * (rtt - yeah->baseRTT), rtt); - - maxqueue = TCP_YEAH_ALPHA; - - if (queue > maxqueue || - rtt - yeah->baseRTT > (yeah->baseRTT / TCP_YEAH_PHY)) { - - if (queue > maxqueue && tp->snd_cwnd > yeah->reno_count) { - u32 reduction = min( queue / TCP_YEAH_GAMMA , - tp->snd_cwnd >> TCP_YEAH_EPSILON ); + /* Compute excess number of packets above bandwidth + * Avoid doing full 64 bit divide. + */ + bw = tp->snd_cwnd; + bw *= rtt - yeah->baseRTT; + do_div(bw, rtt); + queue = bw; + + if (queue > TCP_YEAH_ALPHA || + rtt - yeah->baseRTT > (yeah->baseRTT / TCP_YEAH_PHY)) { + if (queue > TCP_YEAH_ALPHA + && tp->snd_cwnd > yeah->reno_count) { + u32 reduction = min(queue / TCP_YEAH_GAMMA , + tp->snd_cwnd >> TCP_YEAH_EPSILON); tp->snd_cwnd -= reduction; - tp->snd_cwnd = max( tp->snd_cwnd, yeah->reno_count); + tp->snd_cwnd = max(tp->snd_cwnd, + yeah->reno_count); tp->snd_ssthresh = tp->snd_cwnd; - } + } if (yeah->reno_count <= 2) - yeah->reno_count = max( tp->snd_cwnd>>1, 2U); + yeah->reno_count = max(tp->snd_cwnd>>1, 2U); else yeah->reno_count++; - yeah->doing_reno_now = - min_t( u32, yeah->doing_reno_now + 1 , 0xffffff); - + yeah->doing_reno_now = min(yeah->doing_reno_now + 1, + 0xffffffU); } else { yeah->fast_count++; |