Re: [dpdk-dev] [PATCH v3 09/12] event/octeontx: optimize timer adapter resolution parameters

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

-----Original Message-----
> Date: Tue,  3 Apr 2018 20:35:11 +0530
> From: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
> To: jerin.jacob@caviumnetworks.com, santosh.shukla@caviumnetworks.com,
>  erik.g.carrillo@intel.com
> Cc: dev@dpdk.org, Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
> Subject: [dpdk-dev] [PATCH v3 09/12] event/octeontx: optimize timer adapter
>  resolution parameters
> X-Mailer: git-send-email 2.16.3
> 
> When application sets `RTE_EVENT_TIMER_ADAPTER_F_ADJUST_RES` flag
> while creating adapter underlying driver is free to optimize the
> resolution for best possible configuration.
> 
> Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
> ---
>  static int
>  timvf_ring_start(const struct rte_event_timer_adapter *adptr)
>  {
> @@ -217,7 +256,7 @@ timvf_ring_create(struct rte_event_timer_adapter *adptr)
>  	}
>  
>  	timr->tim_ring_id = adptr->data->id;
> -	timr->tck_nsec = rcfg->timer_tick_ns;
> +	timr->tck_nsec = RTE_ALIGN_MUL_CEIL(rcfg->timer_tick_ns, 10);
>  	timr->max_tout = rcfg->max_tmo_ns;
>  	timr->meta.nb_bkts = (timr->max_tout / timr->tck_nsec) + 1;
>  	timr->vbar0 = octeontx_timvf_bar(timr->tim_ring_id, 0);
> @@ -227,6 +266,13 @@ timvf_ring_create(struct rte_event_timer_adapter *adptr)
>  
>  	timr->nb_chunks = nb_timers / nb_chunk_slots;
>  
> +	/* Try to optimize the bucket parameters. */
> +	if ((rcfg->flags & RTE_EVENT_TIMER_ADAPTER_F_ADJUST_RES)
> +			&& !rte_is_power_of_2(timr->meta.nb_bkts)) {
> +		optimize_bucket_parameters(timr);
> +		timvf_log_info("Optimizing configured values");

You could print the adjusted values here.

> +	}
> +
>  	if (rcfg->flags & RTE_EVENT_TIMER_ADAPTER_F_SP_PUT) {
>  		mp_flags = MEMPOOL_F_SP_PUT | MEMPOOL_F_SC_GET;
>  		timvf_log_info("Using single producer mode");
> diff --git a/drivers/event/octeontx/timvf_evdev.h b/drivers/event/octeontx/timvf_evdev.h
> index d8a6d111f..22c8c2266 100644
> --- a/drivers/event/octeontx/timvf_evdev.h
> +++ b/drivers/event/octeontx/timvf_evdev.h
> @@ -192,6 +192,12 @@ bkt_mod(const uint32_t rel_bkt, const uint32_t nb_bkts)
>  	return rel_bkt % nb_bkts;
>  }
>  
> +static __rte_always_inline uint32_t __hot

__hot may not be required here as it in as inline function.

> +bkt_and(uint32_t rel_bkt, uint32_t nb_bkts)
> +{
> +	return rel_bkt & (nb_bkts - 1);
> +}
> +
>  int timvf_timer_adapter_caps_get(const struct rte_eventdev *dev, uint64_t flags,
>  		uint32_t *caps, const struct rte_event_timer_adapter_ops **ops);
>  uint16_t timvf_timer_unreg_burst(const struct rte_event_timer_adapter *adptr,

With above change:
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>