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From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"alialnu@mellanox.com" <alialnu@mellanox.com>,
	"orgerlitz@mellanox.com" <orgerlitz@mellanox.com>,
	"wenzhuo.lu@intel.com" <wenzhuo.lu@intel.com>,
	"beilei.xing@intel.com" <beilei.xing@intel.com>,
	"bernard.iremonger@intel.com" <bernard.iremonger@intel.com>
Cc: "hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>,
	"jerinj@marvell.com" <jerinj@marvell.com>,
	"viacheslavo@mellanox.com" <viacheslavo@mellanox.com>,
	"thomas@monjalon.net" <thomas@monjalon.net>,
	Ruifeng Wang <Ruifeng.Wang@arm.com>,
	Phil Yang <Phil.Yang@arm.com>, nd <nd@arm.com>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH v2 5/5] app/testpmd: enable empty polls in burst stats
Date: Mon, 6 Jul 2020 19:11:28 +0000
Message-ID: <DB6PR0802MB22161D208AA45F56D4CD9E6698690@DB6PR0802MB2216.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <4ca0b9e5-9808-7c2f-a818-225058e875be@intel.com>

Hi Ferruh,
	Thanks for the review comments

<snip>

> Subject: Re: [PATCH v2 5/5] app/testpmd: enable empty polls in burst stats
> 
> 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.
The empty poll stats are being shown always (even if there were no empty polls). The check 'nb_pkts == 0' indicates that the burst stats are for empty polls. Hence this assignment is required. But, this can be moved out of the loop to provide clarity. I will do that.

> 
> > -		} 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".
The empty polls are always shown, even if there were 0% empty polls.

> 
> <...>
> 
> Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

  reply	other threads:[~2020-07-06 19:11 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-17 14:43 [dpdk-dev] [PATCH 1/5] app/testpmd: clock gettime call in throughput calculation Honnappa Nagarahalli
2020-06-17 14:43 ` [dpdk-dev] [PATCH 2/5] app/testpmd: enable burst stats for flowgen mode rx path Honnappa Nagarahalli
2020-06-18 14:57   ` Phil Yang
2020-06-17 14:43 ` [dpdk-dev] [PATCH 3/5] app/testpmd: enable burst stats for noisy vnf mode Honnappa Nagarahalli
2020-06-18  7:16   ` Jens Freimann
2020-06-17 14:43 ` [dpdk-dev] [PATCH 4/5] app/testpmd: fix burst percentage calculation Honnappa Nagarahalli
2020-06-18 15:01   ` Phil Yang
2020-06-23 13:33   ` Ali Alnubani
2020-06-17 14:43 ` [dpdk-dev] [PATCH 5/5] app/testpmd: enable empty polls in burst stats Honnappa Nagarahalli
2020-06-18 15:05   ` Phil Yang
2020-06-23 13:34   ` Ali Alnubani
2020-06-17 15:16 ` [dpdk-dev] [PATCH 1/5] app/testpmd: clock gettime call in throughput calculation Jerin Jacob
2020-06-18  4:03   ` Honnappa Nagarahalli
2020-06-18 10:16     ` Jerin Jacob
2020-06-18 15:08 ` Phil Yang
2020-06-23 13:33 ` Ali Alnubani
2020-06-26 22:09 ` [dpdk-dev] [PATCH v2 " Honnappa Nagarahalli
2020-06-26 22:09   ` [dpdk-dev] [PATCH v2 2/5] app/testpmd: enable burst stats for flowgen mode rx path Honnappa Nagarahalli
2020-07-06 16:02     ` Ferruh Yigit
2020-07-06 17:06       ` Honnappa Nagarahalli
2020-07-06 17:17         ` Ferruh Yigit
2020-07-06 18:46           ` Honnappa Nagarahalli
2020-06-26 22:09   ` [dpdk-dev] [PATCH v2 3/5] app/testpmd: enable burst stats for noisy vnf mode Honnappa Nagarahalli
2020-07-06 16:08     ` Ferruh Yigit
2020-07-06 16:59       ` Honnappa Nagarahalli
2020-07-06 17:11         ` Ferruh Yigit
2020-07-06 17:41           ` Honnappa Nagarahalli
2020-06-26 22:09   ` [dpdk-dev] [PATCH v2 4/5] app/testpmd: fix burst percentage calculation Honnappa Nagarahalli
2020-07-06 16:10     ` Ferruh Yigit
2020-06-26 22:09   ` [dpdk-dev] [PATCH v2 5/5] app/testpmd: enable empty polls in burst stats Honnappa Nagarahalli
2020-07-06 17:05     ` Ferruh Yigit
2020-07-06 19:11       ` Honnappa Nagarahalli [this message]
2020-07-07  9:32         ` Ferruh Yigit
2020-07-06 15:36   ` [dpdk-dev] [PATCH v2 1/5] app/testpmd: clock gettime call in throughput calculation Ferruh Yigit
2020-07-06 16:53     ` Honnappa Nagarahalli
2020-07-06 17:19       ` Ferruh Yigit
2020-07-06 23:32 ` [dpdk-dev] [PATCH v3 1/3] " Honnappa Nagarahalli
2020-07-06 23:32   ` [dpdk-dev] [PATCH v3 2/3] app/testpmd: fix burst percentage calculation Honnappa Nagarahalli
2020-07-06 23:32   ` [dpdk-dev] [PATCH v3 3/3] app/testpmd: enable empty polls in burst stats Honnappa Nagarahalli
2020-07-07 17:47   ` [dpdk-dev] [PATCH v3 1/3] app/testpmd: clock gettime call in throughput calculation Ferruh Yigit

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