[PATCH v3 2/2] timer/linux/x86: override TSC freq if no tsc_known_freq

[Stephen Hemminger]

On Tue,  1 Oct 2024 03:22:51 +0300
Isaac Boukris <iboukris at gmail.com> wrote:

> diff --git a/lib/eal/windows/eal_timer.c b/lib/eal/windows/eal_timer.c
> index b070cb7751..cfd6c267ac 100644
> --- a/lib/eal/windows/eal_timer.c
> +++ b/lib/eal/windows/eal_timer.c
> @@ -49,13 +49,16 @@ rte_delay_us_sleep(unsigned int us)
>  }
>  
>  uint64_t
> -get_tsc_freq(void)
> +get_tsc_freq(uint64_t arch_hz)
>  {
>  	LARGE_INTEGER t_start, t_end, elapsed_us;
>  	LARGE_INTEGER frequency;
>  	uint64_t tsc_hz;
>  	uint64_t end, start;
>  
> +	if (arch_hz)
> +		return arch_hz;
> +
>  	QueryPerformanceFrequency(&frequency);
>  
>  	QueryPerformanceCounter(&t_start);
> -- 

On Windows, I would not use arch_hz at all, since it is opaque how
the Windows kernel determines the frequency, and best not to get
skew.