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| author |   Deepti Raghavan <deeptir@mit.edu> | 2018-07-09 17:53:39 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-07-11 23:01:56 -0700 |
| commit | 4929c9428a171145f82f81aae0c3c25ef7d82837 (patch) | |
| tree | 06b40ce94924ece01ded4e949be9ba05f977faef /net/ipv4/tcp_rate.c | |
| parent | net: sched: fix unprotected access to rcu cookie pointer (diff) | |
| download | linux-dev-4929c9428a171145f82f81aae0c3c25ef7d82837.tar.xz linux-dev-4929c9428a171145f82f81aae0c3c25ef7d82837.zip | |
tcp: expose both send and receive intervals for rate sample
Congestion control algorithms, which access the rate sample
through the tcp_cong_control function, only have access to the maximum
of the send and receive interval, for cases where the acknowledgment
rate may be inaccurate due to ACK compression or decimation. Algorithms
may want to use send rates and receive rates as separate signals.
Signed-off-by: Deepti Raghavan <deeptir@mit.edu>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_rate.c')
| -rw-r--r-- | net/ipv4/tcp_rate.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/tcp_rate.c b/net/ipv4/tcp_rate.c index c61240e43923..4dff40dad4dc 100644 --- a/net/ipv4/tcp_rate.c +++ b/net/ipv4/tcp_rate.c @@ -146,6 +146,10 @@ void tcp_rate_gen(struct sock *sk, u32 delivered, u32 lost, rs->prior_mstamp); /* ack phase */ rs->interval_us = max(snd_us, ack_us); + /* Record both segment send and ack receive intervals */ + rs->snd_interval_us = snd_us; + rs->rcv_interval_us = ack_us; + /* Normally we expect interval_us >= min-rtt. * Note that rate may still be over-estimated when a spuriously * retransmistted skb was first (s)acked because "interval_us" |