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44 lines
1.1 KiB
44 lines
1.1 KiB
/* |
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* tc_core.c TC core library. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version |
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* 2 of the License, or (at your option) any later version. |
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* |
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
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* |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <syslog.h> |
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#include <fcntl.h> |
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#include <math.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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#include <string.h> |
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#include "tc_core.h" |
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int tc_setup_estimator(unsigned A, unsigned time_const, struct tc_estimator *est) |
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{ |
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for (est->interval=0; est->interval<=5; est->interval++) { |
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if (A <= (1<<est->interval)*(TIME_UNITS_PER_SEC/4)) |
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break; |
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} |
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if (est->interval > 5) |
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return -1; |
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est->interval -= 2; |
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for (est->ewma_log=1; est->ewma_log<32; est->ewma_log++) { |
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double w = 1.0 - 1.0/(1<<est->ewma_log); |
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if (A/(-log(w)) > time_const) |
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break; |
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} |
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est->ewma_log--; |
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if (est->ewma_log==0 || est->ewma_log >= 31) |
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return -1; |
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return 0; |
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}
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