Author: tuexen Date: Wed Jul 1 19:23:15 2020 New Revision: 362854 URL: https://svnweb.freebsd.org/changeset/base/362854
Log: MFC r354772: Implement a TCP CUBIC-specific after idle reaction. This patch addresses a very common case of frequent application stalls, where TCP runs idle and looses the state of the network. Submitted by: rscheff Reviewed by: Cheng Cui Differential Revision: https://reviews.freebsd.org/D18954 Modified: stable/12/sys/netinet/cc/cc_cubic.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/cc/cc_cubic.c ============================================================================== --- stable/12/sys/netinet/cc/cc_cubic.c Wed Jul 1 19:15:43 2020 (r362853) +++ stable/12/sys/netinet/cc/cc_cubic.c Wed Jul 1 19:23:15 2020 (r362854) @@ -78,6 +78,7 @@ static int cubic_mod_init(void); static void cubic_post_recovery(struct cc_var *ccv); static void cubic_record_rtt(struct cc_var *ccv); static void cubic_ssthresh_update(struct cc_var *ccv); +static void cubic_after_idle(struct cc_var *ccv); struct cubic { /* Cubic K in fixed point form with CUBIC_SHIFT worth of precision. */ @@ -115,6 +116,7 @@ struct cc_algo cubic_cc_algo = { .conn_init = cubic_conn_init, .mod_init = cubic_mod_init, .post_recovery = cubic_post_recovery, + .after_idle = cubic_after_idle, }; static void @@ -206,7 +208,24 @@ cubic_ack_received(struct cc_var *ccv, uint16_t type) } } +/* + * This is a Cubic specific implementation of after_idle. + * - Reset cwnd by calling New Reno implementation of after_idle. + * - Reset t_last_cong. + */ static void +cubic_after_idle(struct cc_var *ccv) +{ + struct cubic *cubic_data; + + cubic_data = ccv->cc_data; + + newreno_cc_algo.after_idle(ccv); + cubic_data->t_last_cong = ticks; +} + + +static void cubic_cb_destroy(struct cc_var *ccv) { free(ccv->cc_data, M_CUBIC); @@ -303,9 +322,6 @@ cubic_conn_init(struct cc_var *ccv) static int cubic_mod_init(void) { - - cubic_cc_algo.after_idle = newreno_cc_algo.after_idle; - return (0); } _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[email protected]"
