svn commit: r354772 - head/sys/netinet/cc
Michael Tuexen
tuexen at FreeBSD.org
Sat Nov 16 11:37:27 UTC 2019
Author: tuexen
Date: Sat Nov 16 11:37:26 2019
New Revision: 354772
URL: https://svnweb.freebsd.org/changeset/base/354772
Log:
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: Richard Scheffenegger
Reviewed by: Cheng Cui
Differential Revision: https://reviews.freebsd.org/D18954
Modified:
head/sys/netinet/cc/cc_cubic.c
Modified: head/sys/netinet/cc/cc_cubic.c
==============================================================================
--- head/sys/netinet/cc/cc_cubic.c Sat Nov 16 11:10:09 2019 (r354771)
+++ head/sys/netinet/cc/cc_cubic.c Sat Nov 16 11:37:26 2019 (r354772)
@@ -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);
}
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