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/* Test routines for the CoDel implementation
*
* (C) 2015 by sysmocom s.f.m.c. GmbH
* Author: Jacob Erlbeck <jerlbeck@sysmocom.de>
*/
#undef _GNU_SOURCE
#define _GNU_SOURCE
#if 0
#include <osmocom/core/talloc.h>
#include <osmocom/core/prim.h>
#endif
#include <osmocom/core/application.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/timer_compat.h>
#include <osmocom/core/logging.h>
#include "gprs_codel.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
static int do_codel_control(struct gprs_codel *state, const struct timespec *recv,
struct timespec *now, const struct timespec *delta_now, int count)
{
int drop;
drop = gprs_codel_control(state, recv, now, -1);
if (drop) {
printf("Dropping packet %d, "
"recv = %d.%03d, now = %d.%03d, "
"codel.count = %d\n",
count,
(int)recv->tv_sec, (int)recv->tv_nsec/1000000,
(int)now->tv_sec, (int)now->tv_nsec/1000000,
state->count);
} else {
timespecadd(now, delta_now, now);
}
return drop == 0 ? 0 : 1;
}
static void test_codel(void)
{
struct gprs_codel codel;
struct timespec now;
struct timespec recv;
const struct timespec delta_now = {0, 10000000};
const struct timespec init_delta_recv = {0, 5000000};
struct timespec delta_recv;
unsigned count;
unsigned sum = 0;
unsigned dropped = 0;
int drop;
printf("----- %s START\n", __func__);
gprs_codel_init(&codel);
gprs_codel_set_interval(&codel, 100);
timespecclear(&now);
timespecclear(&recv);
delta_recv = init_delta_recv;
for (count = 0; count < 20; count++, sum++) {
drop = do_codel_control(&codel, &recv, &now, &delta_now, sum);
timespecadd(&recv, &delta_recv, &recv);
dropped += drop;
}
printf("Dropped %d packets\n", dropped);
OSMO_ASSERT(dropped == 0);
OSMO_ASSERT(!codel.dropping);
for (count = 0; count < 20; count++, sum++) {
drop = do_codel_control(&codel, &recv, &now, &delta_now, sum);
timespecadd(&recv, &delta_recv, &recv);
dropped += drop;
}
OSMO_ASSERT(dropped == 2);
OSMO_ASSERT(codel.dropping);
/* slow down recv rate */
delta_recv.tv_nsec = delta_now.tv_nsec;
for (count = 0; count < 75; count++, sum++) {
drop = do_codel_control(&codel, &recv, &now, &delta_now, sum);
timespecadd(&recv, &delta_recv, &recv);
dropped += drop;
}
OSMO_ASSERT(dropped == 20);
OSMO_ASSERT(codel.dropping);
for (count = 0; count < 50; count++, sum++) {
drop = do_codel_control(&codel, &recv, &now, &delta_now, sum);
timespecadd(&recv, &delta_recv, &recv);
dropped += drop;
}
OSMO_ASSERT(dropped == 20);
OSMO_ASSERT(!codel.dropping);
OSMO_ASSERT(codel.count >= 20);
/* go back to old data rate */
delta_recv = init_delta_recv;
for (count = 0; count < 20; count++, sum++) {
drop = do_codel_control(&codel, &recv, &now, &delta_now, sum);
timespecadd(&recv, &delta_recv, &recv);
dropped += drop;
}
OSMO_ASSERT(dropped == 20);
OSMO_ASSERT(!codel.dropping);
for (count = 0; count < 20; count++, sum++) {
drop = do_codel_control(&codel, &recv, &now, &delta_now, sum);
timespecadd(&recv, &delta_recv, &recv);
dropped += drop;
}
OSMO_ASSERT(dropped == 22);
OSMO_ASSERT(codel.count >= 2);
printf("Dropped %d packets\n", dropped);
printf("----- %s END\n", __func__);
}
static struct log_info info = {};
int main(int argc, char **argv)
{
osmo_init_logging2(NULL, &info);
log_set_use_color(osmo_stderr_target, 0);
log_set_print_filename(osmo_stderr_target, 0);
log_set_log_level(osmo_stderr_target, LOGL_INFO);
printf("===== CoDel test START\n");
test_codel();
printf("===== CoDel test END\n\n");
exit(EXIT_SUCCESS);
}
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