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Add histogram for time budget printed at the exit of shm_radio

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This commit is contained in:
Bartosz Podrygajlo
2025-03-26 14:31:09 +01:00
parent 1a69a4efe1
commit 5512791190
1 changed files with 33 additions and 0 deletions
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radio/shm_radio/shm_radio.c
+33
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@@ -60,6 +60,13 @@ typedef enum { ROLE_SERVER = 1, ROLE_CLIENT } role;
};
// clang-format on
typedef struct histogram_s {
uint64_t diff[30];
int num_samples;
int min_samples;
double range;
} histogram_t;
typedef struct {
int role;
char channel_name[40];
@@ -76,8 +83,29 @@ typedef struct {
uint64_t rx_early;
uint64_t rx_samples_total;
double average_tx_budget;
histogram_t tx_histogram;
} shm_radio_state_t;
static void histogram_add(histogram_t *histogram, double diff)
{
histogram->num_samples++;
if (histogram->num_samples >= histogram->min_samples) {
int bin = min(sizeofArray(histogram->diff) - 1, max(0, (int)(diff / histogram->range * sizeofArray(histogram->diff))));
histogram->diff[bin]++;
}
}
static void histogram_print(histogram_t *histogram)
{
LOG_I(HW, "SHM_RADIO: TX budget histogram: %d samples\n", histogram->num_samples);
float bin_size = histogram->range / sizeofArray(histogram->diff);
float bin_start = 0;
for (int i = 0; i < sizeofArray(histogram->diff); i++) {
LOG_I(HW, "Bin %d\t[%.1f - %.1fuS]:\t\t%lu\n", i, bin_start, bin_start + bin_size, histogram->diff[i]);
bin_start += bin_size;
}
}
static void shm_radio_readconfig(shm_radio_state_t *shm_radio_state)
{
char *channel_name = NULL;
@@ -157,6 +185,7 @@ static int shm_radio_write(openair0_device *device,
int64_t diff = timestamp - sample;
double budget = diff / (shm_radio_state->sample_rate / 1e6);
shm_radio_state->average_tx_budget = .05 * budget + .95 * shm_radio_state->average_tx_budget;
histogram_add(&shm_radio_state->tx_histogram, budget);
int ret = shm_td_iq_channel_tx(shm_radio_state->channel, timestamp, nsamps, 0, samplesVoid[0]);
if (ret == CHANNEL_ERROR_TOO_LATE) {
@@ -201,6 +230,7 @@ static void shm_radio_end(openair0_device *device)
shm_radio_state->tx_early,
shm_radio_state->rx_early);
LOG_I(HW, "SHM_RADIO: Average TX budget %.3lf uS\n", shm_radio_state->average_tx_budget);
histogram_print(&shm_radio_state->tx_histogram);
shm_td_iq_channel_destroy(shm_radio_state->channel);
}
@@ -236,5 +266,8 @@ __attribute__((__visibility__("default"))) int device_init(openair0_device *devi
device->trx_write_init = shm_radio_stub;
shm_radio_state->last_received_sample = 0;
shm_radio_state->sample_rate = openair0_cfg->sample_rate;
shm_radio_state->tx_histogram.min_samples = 100;
// Set the histogram range to 3000uS. Anything above that is not interesting
shm_radio_state->tx_histogram.range = 3000.0;
return 0;
}