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For idle TCP sessions using the CUBIC congestio control, reset ssthresh

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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
This commit is contained in:
Michael Tuexen 2019-11-14 16:28:02 +00:00
parent 4916bb44b0
commit 730cbbc10d
1 changed files with 19 additions and 3 deletions
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22
sys/netinet/cc/cc_cubic.c
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@ -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
@ -192,6 +194,23 @@ 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)
{
@ -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);
}