Author: tuexen Date: Thu Nov 14 16:28:02 2019 New Revision: 354708 URL: https://svnweb.freebsd.org/changeset/base/354708
Log: For idle TCP sessions using the CUBIC congestio control, reset ssthresh to the higher of the previous ssthresh or 3/4 of the prior cwnd. Submitted by: Richard Scheffenegger Reviewed by: Cheng Cui Differential Revision: https://reviews.freebsd.org/D18982 Modified: head/sys/netinet/cc/cc_cubic.c Modified: head/sys/netinet/cc/cc_cubic.c ============================================================================== --- head/sys/netinet/cc/cc_cubic.c Thu Nov 14 15:10:01 2019 (r354707) +++ head/sys/netinet/cc/cc_cubic.c Thu Nov 14 16:28:02 2019 (r354708) @@ -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. */ @@ -112,6 +113,7 @@ 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 @@ -192,7 +194,24 @@ 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); @@ -287,9 +306,6 @@ 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); } _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
