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Compute thresholds for OOS from ConnLimit_ when setting options
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5e571900b3
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1c0c0022d8
@ -1334,6 +1334,32 @@ options_act_reversible(const or_options_t *old_options, char **msg)
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connection_mark_for_close(conn);
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}
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});
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if (set_conn_limit) {
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/*
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* If we adjusted the conn limit, recompute the OOS threshold too
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*
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* How many possible sockets to keep in reserve? If we have lots of
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* possible sockets, keep this below a limit and set ConnLimit_high_thresh
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* very close to ConnLimit_, but if ConnLimit_ is low, shrink it in
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* proportion.
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*
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* Somewhat arbitrarily, set socks_in_reserve to 5% of ConnLimit_, but
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* cap it at 64.
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*/
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int socks_in_reserve = options->ConnLimit_ / 20;
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if (socks_in_reserve > 64) socks_in_reserve = 64;
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options->ConnLimit_high_thresh = options->ConnLimit_ - socks_in_reserve;
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options->ConnLimit_low_thresh = (options->ConnLimit_ / 4) * 3;
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log_info(LD_GENERAL,
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"Recomputed OOS thresholds: ConnLimit %d, ConnLimit_ %d, "
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"ConnLimit_high_thresh %d, ConnLimit_low_thresh %d",
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options->ConnLimit, options->ConnLimit_,
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options->ConnLimit_high_thresh,
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options->ConnLimit_low_thresh);
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}
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goto done;
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rollback:
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@ -3699,6 +3699,10 @@ typedef struct {
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int ConnLimit; /**< Demanded minimum number of simultaneous connections. */
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int ConnLimit_; /**< Maximum allowed number of simultaneous connections. */
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int ConnLimit_high_thresh; /**< start trying to lower socket usage if we
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* have this many. */
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int ConnLimit_low_thresh; /**< try to get down to here after socket
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* exhaustion. */
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int RunAsDaemon; /**< If true, run in the background. (Unix only) */
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int FascistFirewall; /**< Whether to prefer ORs reachable on open ports. */
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smartlist_t *FirewallPorts; /**< Which ports our firewall allows
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