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-rw-r--r--tc/tc_estimator.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/tc/tc_estimator.c b/tc/tc_estimator.c
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+++ b/tc/tc_estimator.c
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+/*
+ * tc_core.c TC core library.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <math.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include "utils.h"
+#include "tc_core.h"
+
+int tc_setup_estimator(unsigned int A, unsigned int time_const, struct tc_estimator *est)
+{
+ for (est->interval = 0; est->interval <= 5; est->interval++) {
+ if (A <= (1<<est->interval)*(TIME_UNITS_PER_SEC/4))
+ break;
+ }
+ if (est->interval > 5)
+ return -1;
+ est->interval -= 2;
+ for (est->ewma_log = 1; est->ewma_log < 32; est->ewma_log++) {
+ double w = 1.0 - 1.0/(1<<est->ewma_log);
+
+ if (A/(-log(w)) > time_const)
+ break;
+ }
+ est->ewma_log--;
+ if (est->ewma_log == 0 || est->ewma_log >= 31)
+ return -1;
+ return 0;
+}