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![Yuchung Cheng](/assets/img/avatar_default.png)
This patch implements the second half of RACK that uses the the most recent transmit time among all delivered packets to detect losses. tcp_rack_mark_lost() is called upon receiving a dubious ACK. It then checks if an not-yet-sacked packet was sent at least "reo_wnd" prior to the sent time of the most recently delivered. If so the packet is deemed lost. The "reo_wnd" reordering window starts with 1msec for fast loss detection and changes to min-RTT/4 when reordering is observed. We found 1msec accommodates well on tiny degree of reordering (<3 pkts) on faster links. We use min-RTT instead of SRTT because reordering is more of a path property but SRTT can be inflated by self-inflicated congestion. The factor of 4 is borrowed from the delayed early retransmit and seems to work reasonably well. Since RACK is still experimental, it is now used as a supplemental loss detection on top of existing algorithms. It is only effective after the fast recovery starts or after the timeout occurs. The fast recovery is still triggered by FACK and/or dupack threshold instead of RACK. We introduce a new sysctl net.ipv4.tcp_recovery for future experiments of loss recoveries. For now RACK can be disabled by setting it to 0. Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
#include <linux/tcp.h>
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#include <net/tcp.h>
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int sysctl_tcp_recovery __read_mostly = TCP_RACK_LOST_RETRANS;
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/* Marks a packet lost, if some packet sent later has been (s)acked.
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* The underlying idea is similar to the traditional dupthresh and FACK
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* but they look at different metrics:
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*
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* dupthresh: 3 OOO packets delivered (packet count)
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* FACK: sequence delta to highest sacked sequence (sequence space)
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* RACK: sent time delta to the latest delivered packet (time domain)
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*
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* The advantage of RACK is it applies to both original and retransmitted
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* packet and therefore is robust against tail losses. Another advantage
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* is being more resilient to reordering by simply allowing some
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* "settling delay", instead of tweaking the dupthresh.
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*
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* The current version is only used after recovery starts but can be
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* easily extended to detect the first loss.
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*/
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int tcp_rack_mark_lost(struct sock *sk)
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{
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struct tcp_sock *tp = tcp_sk(sk);
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struct sk_buff *skb;
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u32 reo_wnd, prior_retrans = tp->retrans_out;
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if (inet_csk(sk)->icsk_ca_state < TCP_CA_Recovery || !tp->rack.advanced)
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return 0;
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/* Reset the advanced flag to avoid unnecessary queue scanning */
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tp->rack.advanced = 0;
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/* To be more reordering resilient, allow min_rtt/4 settling delay
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* (lower-bounded to 1000uS). We use min_rtt instead of the smoothed
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* RTT because reordering is often a path property and less related
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* to queuing or delayed ACKs.
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*
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* TODO: measure and adapt to the observed reordering delay, and
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* use a timer to retransmit like the delayed early retransmit.
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*/
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reo_wnd = 1000;
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if (tp->rack.reord && tcp_min_rtt(tp) != ~0U)
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reo_wnd = max(tcp_min_rtt(tp) >> 2, reo_wnd);
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tcp_for_write_queue(skb, sk) {
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struct tcp_skb_cb *scb = TCP_SKB_CB(skb);
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if (skb == tcp_send_head(sk))
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break;
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/* Skip ones already (s)acked */
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if (!after(scb->end_seq, tp->snd_una) ||
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scb->sacked & TCPCB_SACKED_ACKED)
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continue;
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if (skb_mstamp_after(&tp->rack.mstamp, &skb->skb_mstamp)) {
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if (skb_mstamp_us_delta(&tp->rack.mstamp,
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&skb->skb_mstamp) <= reo_wnd)
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continue;
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/* skb is lost if packet sent later is sacked */
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tcp_skb_mark_lost_uncond_verify(tp, skb);
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if (scb->sacked & TCPCB_SACKED_RETRANS) {
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scb->sacked &= ~TCPCB_SACKED_RETRANS;
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tp->retrans_out -= tcp_skb_pcount(skb);
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NET_INC_STATS_BH(sock_net(sk),
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LINUX_MIB_TCPLOSTRETRANSMIT);
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}
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} else if (!(scb->sacked & TCPCB_RETRANS)) {
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/* Original data are sent sequentially so stop early
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* b/c the rest are all sent after rack_sent
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*/
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break;
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}
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}
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return prior_retrans - tp->retrans_out;
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}
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/* Record the most recently (re)sent time among the (s)acked packets */
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void tcp_rack_advance(struct tcp_sock *tp,
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const struct skb_mstamp *xmit_time, u8 sacked)
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{
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if (tp->rack.mstamp.v64 &&
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!skb_mstamp_after(xmit_time, &tp->rack.mstamp))
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return;
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if (sacked & TCPCB_RETRANS) {
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struct skb_mstamp now;
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/* If the sacked packet was retransmitted, it's ambiguous
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* whether the retransmission or the original (or the prior
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* retransmission) was sacked.
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*
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* If the original is lost, there is no ambiguity. Otherwise
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* we assume the original can be delayed up to aRTT + min_rtt.
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* the aRTT term is bounded by the fast recovery or timeout,
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* so it's at least one RTT (i.e., retransmission is at least
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* an RTT later).
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*/
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skb_mstamp_get(&now);
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if (skb_mstamp_us_delta(&now, xmit_time) < tcp_min_rtt(tp))
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return;
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}
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tp->rack.mstamp = *xmit_time;
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tp->rack.advanced = 1;
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}
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