Hello!
So... It was already set to "auto". Then, I changed to "system timer",
restarted Rosegarden, and now it shows the timer as "OK" (Thanks for
pointing me to the right place in the config). So perhaps the "auto"
setting is not working as expected?
J.
On 2025-01-30 23:24, Ted Felix wrote:
First, make sure "Sequencer timing source" is set to "(auto)" in the
preferences (MIDI > General). That's the most reliable.
If that doesn't clear it up, have a look at my Linux MIDI guide. The
first section "Installing a Low Latency Kernel" covers the steps to
confirm you have a 1000Hz clock configured in your kernel:
http://www.tedfelix.com/linux/linux-midi.html
If those steps reveal a 1000Hz clock, then perhaps Rosegarden isn't
checking the right thing.
Ted.
On 1/28/25 6:46 PM, Jeronimo Pellegrini via Rosegarden-user wrote:
Hello,
I have been seeing the warning about low timer frequency every time I
start Rosegarden. I have tried this:
- I'm using an RT kernel (6.12.11-rt-amd64 from Debian)
- Added myself to the audio group
- The clocksource is hpet (because /sys/devices/system/clocksource/
clocksource0/current_clocksource contains "hpet")
- I have measured the clock frequency, and it seems much better than
250HZ [1] [2]
But still, Rosegarden says the frequency is 250Hz.
What am I missing?
Thanks!
J.
[1] First method:
#include <stdio.h>
#include <time.h>
int main() {
struct timespec res;
// Get the resolution of the CLOCK_MONOTONIC clock
if (clock_getres(CLOCK_MONOTONIC, &res) == -1) {
perror("clock_getres");
return 1;
}
// Calculate total resolution in seconds
long double total_resolution_seconds = res.tv_sec + (res.tv_nsec
/ 1e9);
// Calculate frequency in Hertz
long double frequency_hz = 1.0 / total_resolution_seconds;
// Print the resolution and frequency
printf("Timer resolution:\n");
printf("Seconds: %ld\n", res.tv_sec);
printf("Nanoseconds: %ld\n", res.tv_nsec);
printf("Frequency: %.2Lf Hz\n", frequency_hz);
return 0;
}
[2] Second method:
https://advenage.com/topics/linux-timer-interrupt-frequency
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