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aba5acdf SH |
1 | /* |
2 | * tc_core.c TC core library. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <unistd.h> | |
16 | #include <syslog.h> | |
17 | #include <fcntl.h> | |
18 | #include <math.h> | |
19 | #include <sys/socket.h> | |
20 | #include <netinet/in.h> | |
21 | #include <arpa/inet.h> | |
22 | #include <string.h> | |
23 | ||
24 | #include "tc_core.h" | |
25 | ||
32a121cb | 26 | int tc_setup_estimator(unsigned int A, unsigned int time_const, struct tc_estimator *est) |
aba5acdf | 27 | { |
32a121cb | 28 | for (est->interval = 0; est->interval <= 5; est->interval++) { |
f0bda7e5 | 29 | if (A <= (1<<est->interval)*(TIME_UNITS_PER_SEC/4)) |
aba5acdf SH |
30 | break; |
31 | } | |
32 | if (est->interval > 5) | |
33 | return -1; | |
34 | est->interval -= 2; | |
32a121cb | 35 | for (est->ewma_log = 1; est->ewma_log < 32; est->ewma_log++) { |
aba5acdf | 36 | double w = 1.0 - 1.0/(1<<est->ewma_log); |
32a121cb | 37 | |
aba5acdf SH |
38 | if (A/(-log(w)) > time_const) |
39 | break; | |
40 | } | |
41 | est->ewma_log--; | |
32a121cb | 42 | if (est->ewma_log == 0 || est->ewma_log >= 31) |
aba5acdf SH |
43 | return -1; |
44 | return 0; | |
45 | } |