On Wed, Sep 13, 2023 at 05:09:04PM +0000, Maciek Machnikowski wrote:
> Implement auto mode for frequency setting. In this mode the tool
> will measure the frequency difference between PHC and CLOCK_REALTIME
> and apply the correction to the PHC to match the system clock.
...
> + /* Try sysoff first */
> + method = sysoff_probe(fd, N_SAMPLES);
> + if (method >= 0) {
> + if (sysoff_measure(fd, method, N_SAMPLES,
> + &t1_sys_offset,
> + &t1_sys_ts, &t1_delay)) {
> + return -1;
> + }
> +
> + sleep(1);
This measurement interval is WAY too short. The time stamp error will
spoil the syntonization.
> + if (sysoff_measure(fd, method, N_SAMPLES,
> + &t2_sys_offset,
> + &t2_sys_ts, &t2_delay)) {
> + return -1;
> + }
> +
> + sys_diff = t2_sys_ts - t1_sys_ts;
> + clk_diff = t2_sys_offset - t1_sys_offset;
> + ppb += (1e9 - ppb) * ((double)clk_diff /
> (double)sys_diff);
Thanks,
Richard
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