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Bug 24769: Reduce and parameterize the cbt learning idle timeout.

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This is only half of the changes needed. We should also parameterize the
number of concurrent cbt learning circuits in needs_circuits_for_build().
This commit is contained in:
Mike Perry 2018-01-31 16:27:50 +00:00
parent f0d7905bc9
commit 148c2410af
2 changed files with 21 additions and 4 deletions
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7
changes/bug24769 Normal file
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@ -0,0 +1,7 @@
o Minor bugfixes (performance):
- Reduce the number of circuits that can be opened at once during the
circuit build timeout phase. This is done by increasing the idle timeout
to 3 minutes, and lowering the maximum number of concurrent learning
circuits to 10. Fixes Bug 24769; bugfix on 0.3.1.1-alpha.

18
src/or/circuitlist.c
View File

@ -897,8 +897,10 @@ init_circuit_base(circuit_t *circ)
/** If we haven't yet decided on a good timeout value for circuit
* building, we close idle circuits aggressively so we can get more
* data points. */
#define IDLE_TIMEOUT_WHILE_LEARNING (1*60)
* data points. These are the default, min, and max consensus values */
#define DFLT_IDLE_TIMEOUT_WHILE_LEARNING (3*60)
#define MIN_IDLE_TIMEOUT_WHILE_LEARNING (10)
#define MAX_IDLE_TIMEOUT_WHILE_LEARNING (1000*60)
/** Allocate space for a new circuit, initializing with <b>p_circ_id</b>
* and <b>p_conn</b>. Add it to the global circuit list.
@ -931,7 +933,11 @@ origin_circuit_new(void)
circuit_build_times_needs_circuits(get_circuit_build_times())) {
/* Circuits should be shorter lived if we need more of them
* for learning a good build timeout */
circ->circuit_idle_timeout = IDLE_TIMEOUT_WHILE_LEARNING;
circ->circuit_idle_timeout =
networkstatus_get_param(NULL, "cbtlearntimeout",
DFLT_IDLE_TIMEOUT_WHILE_LEARNING,
MIN_IDLE_TIMEOUT_WHILE_LEARNING,
MAX_IDLE_TIMEOUT_WHILE_LEARNING);
} else {
// This should always be larger than the current port prediction time
// remaining, or else we'll end up with the case where a circuit times out
@ -951,7 +957,11 @@ origin_circuit_new(void)
"%d seconds of predictive building remaining.",
circ->circuit_idle_timeout,
prediction_time_remaining);
circ->circuit_idle_timeout = IDLE_TIMEOUT_WHILE_LEARNING;
circ->circuit_idle_timeout =
networkstatus_get_param(NULL, "cbtlearntimeout",
DFLT_IDLE_TIMEOUT_WHILE_LEARNING,
MIN_IDLE_TIMEOUT_WHILE_LEARNING,
MAX_IDLE_TIMEOUT_WHILE_LEARNING);
}
log_info(LD_CIRC,