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To: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>, dev@dpdk.org,
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<20200626220943.22526-1-honnappa.nagarahalli@arm.com>
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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Message-ID: <4ca0b9e5-9808-7c2f-a818-225058e875be@intel.com>
Date: Mon, 6 Jul 2020 18:05:45 +0100
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Subject: Re: [dpdk-dev] [PATCH v2 5/5] app/testpmd: enable empty polls in
burst stats
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On 6/26/2020 11:09 PM, Honnappa Nagarahalli wrote:
> The number of empty polls provides information about available
> CPU head room in the presence of continuous polling.
+1 to have it, it can be useful.
>
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> Reviewed-by: Phil Yang <phil.yang@arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Tested-by: Phil Yang <phil.yang@arm.com>
> Tested-by: Ali Alnubani <alialnu@mellanox.com>
<...>
> /*
> * First compute the total number of packet bursts and the
> * two highest numbers of bursts of the same number of packets.
> */
> total_burst = 0;
> - burst_stats[0] = burst_stats[1] = burst_stats[2] = 0;
> - pktnb_stats[0] = pktnb_stats[1] = pktnb_stats[2] = 0;
> + memset(&burst_stats, 0x0, sizeof(burst_stats));
> + memset(&pktnb_stats, 0x0, sizeof(pktnb_stats));
> +
> for (nb_pkt = 0; nb_pkt < MAX_PKT_BURST; nb_pkt++) {
> nb_burst = pbs->pkt_burst_spread[nb_pkt];
> - if (nb_burst == 0)
> - continue;
> total_burst += nb_burst;
> - if (nb_burst > burst_stats[0]) {
> - burst_stats[1] = burst_stats[0];
> - pktnb_stats[1] = pktnb_stats[0];
> +
> + /* Show empty poll stats always */
> + if (nb_pkt == 0) {
> burst_stats[0] = nb_burst;
> pktnb_stats[0] = nb_pkt;
just a minor issue but this assignment is not needed.
> - } else if (nb_burst > burst_stats[1]) {
> + continue;
> + }
> +
> + if (nb_burst == 0)
> + continue;
again another minor issue, can have this check above 'nb_pkt == 0', to prevent
unnecssary "burst_stats[0] = nb_burst;" assignment if "nb_burst == 0".
<...>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>