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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>
hifive-unleashed-5.1
Deepti Raghavan 2018-07-09 17:53:39 +00:00 committed by David S. Miller
parent e0479b670d
commit 4929c9428a
2 changed files with 6 additions and 0 deletions
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2
include/net/tcp.h
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@ -954,6 +954,8 @@ struct rate_sample {
u32 prior_delivered; /* tp->delivered at "prior_mstamp" */
s32 delivered; /* number of packets delivered over interval */
long interval_us; /* time for tp->delivered to incr "delivered" */
u32 snd_interval_us; /* snd interval for delivered packets */
u32 rcv_interval_us; /* rcv interval for delivered packets */
long rtt_us; /* RTT of last (S)ACKed packet (or -1) */
int losses; /* number of packets marked lost upon ACK */
u32 acked_sacked; /* number of packets newly (S)ACKed upon ACK */

4
net/ipv4/tcp_rate.c
View File

@ -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"