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Release 2.24.5

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- [FEATURE] Improve Delayed ACKs extension and turn it on by default.
- Limit receive history to a finite amount of memory.
This commit is contained in:
Dmitri Tikhonov 2020-11-24 08:51:36 -05:00
parent 8e6b1576b4
commit f38b395a31
21 changed files with 525 additions and 113 deletions
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55
include/lsquic.h
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@ -25,7 +25,7 @@ extern "C" {
#define LSQUIC_MAJOR_VERSION 2
#define LSQUIC_MINOR_VERSION 24
#define LSQUIC_PATCH_VERSION 4
#define LSQUIC_PATCH_VERSION 5
/**
* Engine flags:
@ -350,8 +350,21 @@ typedef struct ssl_ctx_st * (*lsquic_lookup_cert_f)(
/** Turn spin bit on by default */
#define LSQUIC_DF_SPIN 1
/** Turn off delayed ACKs extension by default */
#define LSQUIC_DF_DELAYED_ACKS 0
/** Turn on delayed ACKs extension by default */
#define LSQUIC_DF_DELAYED_ACKS 1
/**
* Defaults for the Packet Tolerance PID Controller (PTPC) used by the
* Delayed ACKs extension:
*/
#define LSQUIC_DF_PTPC_PERIODICITY 3
#define LSQUIC_DF_PTPC_MAX_PACKTOL 150
#define LSQUIC_DF_PTPC_DYN_TARGET 1
#define LSQUIC_DF_PTPC_TARGET 1.0
#define LSQUIC_DF_PTPC_PROP_GAIN 0.8
#define LSQUIC_DF_PTPC_INT_GAIN 0.35
#define LSQUIC_DF_PTPC_ERR_THRESH 0.05
#define LSQUIC_DF_PTPC_ERR_DIVISOR 0.05
/** Turn on timestamp extension by default */
#define LSQUIC_DF_TIMESTAMPS 1
@ -847,9 +860,6 @@ struct lsquic_engine_settings {
/**
* Enable delayed ACKs extension. Allowed values are 0 and 1.
*
* Warning: this is an experimental feature. Using it will most likely
* lead to degraded performance.
*
* Default value is @ref LSQUIC_DF_DELAYED_ACKS
*/
int es_delayed_acks;
@ -962,6 +972,39 @@ struct lsquic_engine_settings {
* Default value is @ref LSQUIC_DF_QPACK_EXPERIMENT.
*/
int es_qpack_experiment;
/**
* Settings for the Packet Tolerance PID Controller (PTPC) used for
* the Delayed ACKs logic. Periodicity is how often the number of
* incoming ACKs is sampled. Periodicity's units is the number of
* RTTs. Target is the average number of incoming ACKs per RTT we
* want to achieve. Error threshold defines the range of error values
* within which no action is taken. For example, error threshold of
* 0.03 means that adjustment actions will be taken only when the
* error is outside of the [-0.03, 0.03] range. Proportional and
* integral gains have their usual meanings described here:
* https://en.wikipedia.org/wiki/PID_controller#Controller_theory
*
* The average is normalized as follows:
* AvgNormalized = Avg * e / Target # Where 'e' is 2.71828...
*
* The error is then calculated as ln(AvgNormalized) - 1. This gives
* us a logarithmic scale that is convenient to use for adjustment
* calculations. The error divisor is used to calculate the packet
* tolerance adjustment:
* Adjustment = Error / ErrorDivisor
*
* WARNING. The library comes with sane defaults. Only fiddle with
* these knobs if you know what you are doing.
*/
unsigned es_ptpc_periodicity; /* LSQUIC_DF_PTPC_PERIODICITY */
unsigned es_ptpc_max_packtol; /* LSQUIC_DF_PTPC_MAX_PACKTOL */
int es_ptpc_dyn_target; /* LSQUIC_DF_PTPC_DYN_TARGET */
float es_ptpc_target, /* LSQUIC_DF_PTPC_TARGET */
es_ptpc_prop_gain, /* LSQUIC_DF_PTPC_PROP_GAIN */
es_ptpc_int_gain, /* LSQUIC_DF_PTPC_INT_GAIN */
es_ptpc_err_thresh, /* LSQUIC_DF_PTPC_ERR_THRESH */
es_ptpc_err_divisor; /* LSQUIC_DF_PTPC_ERR_DIVISOR */
};
/* Initialize `settings' to default values */