This change re-arranges the fields within the tcp-pcb so that
they are more in order of cache line use as one passes through the tcp_input/output paths (non-errors most likely path). This helps speed up cache line optimization so that the tcp stack runs a bit more efficently. Sponsored by: Netflix Inc. Differential Revision: https://reviews.freebsd.org/D15136
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parent
d40a1b91c0
commit
803a230592
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=333041
@ -83,125 +83,123 @@ STAILQ_HEAD(tcp_log_stailq, tcp_log_mem);
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/*
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* Tcp control block, one per tcp; fields:
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* Organized for 16 byte cacheline efficiency.
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* Organized for 64 byte cacheline efficiency based
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* on common tcp_input/tcp_output processing.
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*/
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struct tcpcb {
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struct tsegqe_head t_segq; /* segment reassembly queue */
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int t_segqlen; /* segment reassembly queue length */
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int t_dupacks; /* consecutive dup acks recd */
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struct mbuf *t_in_pkt; /* head of the input packet queue for the tcp_hpts system */
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struct mbuf *t_tail_pkt; /* tail of the input packet queue for the tcp_hpts system */
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struct tcp_timer *t_timers; /* All the TCP timers in one struct */
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/* Cache line 1 */
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struct inpcb *t_inpcb; /* back pointer to internet pcb */
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int t_state; /* state of this connection */
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struct tcp_function_block *t_fb;/* TCP function call block */
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void *t_fb_ptr; /* Pointer to t_fb specific data */
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uint32_t t_maxseg:24, /* maximum segment size */
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t_logstate:8; /* State of "black box" logging */
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uint32_t t_state:4, /* state of this connection */
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bits_spare : 24;
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u_int t_flags;
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struct vnet *t_vnet; /* back pointer to parent vnet */
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tcp_seq snd_una; /* sent but unacknowledged */
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tcp_seq snd_max; /* highest sequence number sent;
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* used to recognize retransmits
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*/
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tcp_seq snd_nxt; /* send next */
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tcp_seq snd_up; /* send urgent pointer */
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tcp_seq snd_wl1; /* window update seg seq number */
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tcp_seq snd_wl2; /* window update seg ack number */
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tcp_seq iss; /* initial send sequence number */
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tcp_seq irs; /* initial receive sequence number */
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uint32_t snd_wnd; /* send window */
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uint32_t snd_cwnd; /* congestion-controlled window */
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uint32_t cl1_spare; /* Spare to round out CL 1 */
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/* Cache line 2 */
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u_int32_t ts_offset; /* our timestamp offset */
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u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
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int rcv_numsacks; /* # distinct sack blks present */
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u_int t_tsomax; /* TSO total burst length limit in bytes */
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u_int t_tsomaxsegcount; /* TSO maximum segment count */
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u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
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tcp_seq rcv_nxt; /* receive next */
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tcp_seq rcv_adv; /* advertised window */
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uint32_t rcv_wnd; /* receive window */
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u_int t_flags2; /* More tcpcb flags storage */
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int t_srtt; /* smoothed round-trip time */
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int t_rttvar; /* variance in round-trip time */
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u_int32_t ts_recent; /* timestamp echo data */
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u_char snd_scale; /* window scaling for send window */
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u_char rcv_scale; /* window scaling for recv window */
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u_char snd_limited; /* segments limited transmitted */
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u_char request_r_scale; /* pending window scaling */
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tcp_seq last_ack_sent;
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u_int t_rcvtime; /* inactivity time */
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/* Cache line 3 */
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tcp_seq rcv_up; /* receive urgent pointer */
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uint32_t snd_wnd; /* send window */
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uint32_t snd_cwnd; /* congestion-controlled window */
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int t_segqlen; /* segment reassembly queue length */
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struct tsegqe_head t_segq; /* segment reassembly queue */
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struct mbuf *t_in_pkt;
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struct mbuf *t_tail_pkt;
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struct tcp_timer *t_timers; /* All the TCP timers in one struct */
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struct vnet *t_vnet; /* back pointer to parent vnet */
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uint32_t snd_ssthresh; /* snd_cwnd size threshold for
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* for slow start exponential to
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* linear switch
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*/
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tcp_seq snd_wl1; /* window update seg seq number */
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/* Cache line 4 */
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tcp_seq snd_wl2; /* window update seg ack number */
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tcp_seq irs; /* initial receive sequence number */
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tcp_seq iss; /* initial send sequence number */
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u_int t_acktime;
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u_int ts_recent_age; /* when last updated */
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tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
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u_int t_rcvtime; /* inactivity time */
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u_int t_starttime; /* time connection was established */
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u_int t_rtttime; /* RTT measurement start time */
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tcp_seq t_rtseq; /* sequence number being timed */
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int t_rxtcur; /* current retransmit value (ticks) */
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u_int t_maxseg; /* maximum segment size */
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u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
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int t_srtt; /* smoothed round-trip time */
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int t_rttvar; /* variance in round-trip time */
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int t_rxtshift; /* log(2) of rexmt exp. backoff */
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u_int t_rttmin; /* minimum rtt allowed */
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u_int t_rttbest; /* best rtt we've seen */
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u_long t_rttupdated; /* number of times rtt sampled */
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uint32_t max_sndwnd; /* largest window peer has offered */
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int t_softerror; /* possible error not yet reported */
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/* out-of-band data */
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uint16_t cl4_spare; /* Spare to adjust CL 4 */
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char t_oobflags; /* have some */
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char t_iobc; /* input character */
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/* RFC 1323 variables */
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u_char snd_scale; /* window scaling for send window */
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u_char rcv_scale; /* window scaling for recv window */
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u_char request_r_scale; /* pending window scaling */
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u_int32_t ts_recent; /* timestamp echo data */
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u_int ts_recent_age; /* when last updated */
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u_int32_t ts_offset; /* our timestamp offset */
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int t_rxtcur; /* current retransmit value (ticks) */
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tcp_seq last_ack_sent;
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/* experimental */
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int t_rxtshift; /* log(2) of rexmt exp. backoff */
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u_int t_rtttime; /* RTT measurement start time */
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tcp_seq t_rtseq; /* sequence number being timed */
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u_int t_starttime; /* time connection was established */
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u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
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u_int t_rttmin; /* minimum rtt allowed */
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u_int t_rttbest; /* best rtt we've seen */
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int t_softerror; /* possible error not yet reported */
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uint32_t max_sndwnd; /* largest window peer has offered */
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/* Cache line 5 */
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uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */
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uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */
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tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
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int t_sndzerowin; /* zero-window updates sent */
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u_int t_badrxtwin; /* window for retransmit recovery */
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u_char snd_limited; /* segments limited transmitted */
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/* SACK related state */
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u_long t_rttupdated; /* number of times rtt sampled */
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int snd_numholes; /* number of holes seen by sender */
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u_int t_badrxtwin; /* window for retransmit recovery */
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TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
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/* SACK scoreboard (sorted) */
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tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
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int rcv_numsacks; /* # distinct sack blks present */
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struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
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tcp_seq sack_newdata; /* New data xmitted in this recovery
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episode starts at this seq number */
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struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
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struct sackhint sackhint; /* SACK scoreboard hint */
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int t_rttlow; /* smallest observerved RTT */
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u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
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int rfbuf_cnt; /* recv buffer autoscaling byte count */
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struct toedev *tod; /* toedev handling this connection */
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int t_sndrexmitpack; /* retransmit packets sent */
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int t_rcvoopack; /* out-of-order packets received */
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void *t_toe; /* TOE pcb pointer */
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int t_bytes_acked; /* # bytes acked during current RTT */
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struct cc_algo *cc_algo; /* congestion control algorithm */
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struct cc_var *ccv; /* congestion control specific vars */
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struct osd *osd; /* storage for Khelp module data */
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int t_bytes_acked; /* # bytes acked during current RTT */
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u_int t_keepinit; /* time to establish connection */
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u_int t_keepidle; /* time before keepalive probes begin */
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u_int t_keepintvl; /* interval between keepalives */
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u_int t_keepcnt; /* number of keepalives before close */
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u_int t_tsomax; /* TSO total burst length limit in bytes */
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u_int t_tsomaxsegcount; /* TSO maximum segment count */
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u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
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u_int t_flags2; /* More tcpcb flags storage */
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int t_logstate; /* State of "black box" logging */
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struct tcp_log_stailq t_logs; /* Log buffer */
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int t_dupacks; /* consecutive dup acks recd */
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int t_lognum; /* Number of log entries */
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uint32_t t_logsn; /* Log "serial number" */
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struct tcp_log_stailq t_logs; /* Log buffer */
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struct tcp_log_id_node *t_lin;
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struct tcp_log_id_bucket *t_lib;
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const char *t_output_caller; /* Function that called tcp_output */
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struct tcp_function_block *t_fb;/* TCP function call block */
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void *t_fb_ptr; /* Pointer to t_fb specific data */
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uint32_t t_logsn; /* Log "serial number" */
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uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */
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unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */
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union {
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