Re: [dpdk-dev] [PATCH v6 RESEND] eal: add tsc_hz to rte_mem_config

[David Marchand <david.marchand@redhat.com>]

On Tue, Oct 8, 2019 at 10:39 AM Bruce Richardson
<bruce.richardson@intel.com> wrote:
>
> On Mon, Oct 07, 2019 at 08:28:21AM -0700, Jim Harris wrote:
> > This ensures secondary processes never have to
> > calculate the TSC rate themselves, which can be
> > noticeable in VMs that don't have access to
> > arch-specific detection mechanism (such as
> > CPUID leaf 0x15 or MSR 0xCE on x86).
> >
> > Since rte_mem_config is now internal to the rte_eal
> > library, we can add tsc_hz without ABI breakage
> > concerns.
> >
> > Reduces rte_eal_init() execution time in a secondary
> > process from 165ms to 66ms on my test system.
> >
> > Signed-off-by: Jim Harris <james.r.harris@intel.com>
> > ---
> This seems a good idea to me.
>
> Acked-by: Bruce Richardson <bruce.richardson@intel.com>

I wonder if we can get rid of eal_tsc_resolution_hz and just rely on
the shared memory to get/store this info.
Feel free to look at this later and send a followup patch :-).


Applied, thanks.


--
David Marchand