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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