[ntp:questions] How do I validate my PPS clocks?

David Taylor david-taylor at blueyonder.co.uk.invalid
Thu Feb 28 07:37:30 UTC 2013

On 28/02/2013 04:59, ramadog at gmail.com wrote:
> The times are with respect to the time stamp taken at the beginning of
> handle_irq(). 2.7us is to the start of serial8250_interrupt(), 4.5us is to
> the start of serial8250_handle_irq() and so on.
> arch/x86/kernel/irq_32.c handle_irq() 0us
> drivers/tty/serial/8250/8250.c serial8250_interrupt() 2.7us
> drivers/tty/serial/8250/8250.c serial8250_handle_irq() 4.5us
> drivers/tty/serial/8250/8250.c serial8250_modem_status() 7.4us
> drivers/tty/serial/serial_core.c uart_handle_dcd_change() 7.8us
>      include/linux/pps_kernel.h inline pps_get_ts()

What processor and what speed is this being run on, please?  I'm trying 
to get a handle on whether this is a recent PC, an Intel Atom, or an old 
mobile phone!  (OK, I do see the X86!).
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