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
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=354772
@ -78,6 +78,7 @@ static int cubic_mod_init(void);
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static void cubic_post_recovery(struct cc_var *ccv);
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static void cubic_record_rtt(struct cc_var *ccv);
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static void cubic_ssthresh_update(struct cc_var *ccv);
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static void cubic_after_idle(struct cc_var *ccv);
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struct cubic {
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/* Cubic K in fixed point form with CUBIC_SHIFT worth of precision. */
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@ -112,6 +113,7 @@ struct cc_algo cubic_cc_algo = {
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.conn_init = cubic_conn_init,
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.mod_init = cubic_mod_init,
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.post_recovery = cubic_post_recovery,
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.after_idle = cubic_after_idle,
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};
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static void
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@ -192,6 +194,23 @@ cubic_ack_received(struct cc_var *ccv, uint16_t type)
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}
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}
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/*
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* This is a Cubic specific implementation of after_idle.
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* - Reset cwnd by calling New Reno implementation of after_idle.
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* - Reset t_last_cong.
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*/
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static void
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cubic_after_idle(struct cc_var *ccv)
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{
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struct cubic *cubic_data;
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cubic_data = ccv->cc_data;
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newreno_cc_algo.after_idle(ccv);
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cubic_data->t_last_cong = ticks;
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}
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static void
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cubic_cb_destroy(struct cc_var *ccv)
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{
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@ -287,9 +306,6 @@ cubic_conn_init(struct cc_var *ccv)
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static int
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cubic_mod_init(void)
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{
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cubic_cc_algo.after_idle = newreno_cc_algo.after_idle;
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return (0);
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}
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