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From: Ruifeng Wang <Ruifeng.Wang@arm.com>
To: Jerin Jacob <jerinjacobk@gmail.com>
Cc: "jerinj@marvell.com" <jerinj@marvell.com>,
	"hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>,
	Ferruh Yigit <ferruh.yigit@intel.com>,
	"thomas@monjalon.net" <thomas@monjalon.net>,
	David Marchand <david.marchand@redhat.com>,
	dpdk-dev <dev@dpdk.org>, nd <nd@arm.com>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH 3/4] examples/l3fwd: eliminate unnecessary reloads in loop
Date: Wed, 14 Apr 2021 06:02:31 +0000
Message-ID: <HE1PR0802MB247493E6D7D1DB31CCB803509E4E9@HE1PR0802MB2474.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <CALBAE1P8qXasSPmUmzqrkHvAneRmr9ucR0X7wmcRpUF8gtb0TQ@mail.gmail.com>

> -----Original Message-----
> From: Jerin Jacob <jerinjacobk@gmail.com>
> Sent: Wednesday, April 14, 2021 1:43 AM
> To: Ruifeng Wang <Ruifeng.Wang@arm.com>
> Cc: jerinj@marvell.com; hemant.agrawal@nxp.com; Ferruh Yigit
> <ferruh.yigit@intel.com>; thomas@monjalon.net; David Marchand
> <david.marchand@redhat.com>; dpdk-dev <dev@dpdk.org>; nd
> <nd@arm.com>; Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
> Subject: Re: [dpdk-dev] [PATCH 3/4] examples/l3fwd: eliminate unnecessary
> reloads in loop
> 
> On Thu, Mar 18, 2021 at 3:56 PM Ruifeng Wang <ruifeng.wang@arm.com>
> wrote:
> >
> > Number of rx queue and number of rx port in lcore config are constants
> > during the period of l3 forward application running. But compiler has
> > no this information.
> >
> > Copied values from lcore config to local variables and used the local
> > variables for iteration. Compiler can see that the local variables are
> > not changed, so qconf reloads at each iteration can be eliminated.
> >
> > The change showed 1.8% performance uplift in single core, single port,
> > single queue test on N1SDP platform with MLX5 NIC.
> 
> At least, in octeontx2, I dont see any performance improvement.
> But change looks good. Please find below a comment.
> 
> >
> > Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
> > ---
> >  examples/l3fwd/l3fwd_lpm.c | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> >
> > diff --git a/examples/l3fwd/l3fwd_lpm.c b/examples/l3fwd/l3fwd_lpm.c
> > index 3dcf1fef1..d338590b9 100644
> > --- a/examples/l3fwd/l3fwd_lpm.c
> > +++ b/examples/l3fwd/l3fwd_lpm.c
> > @@ -190,14 +190,16 @@ lpm_main_loop(__rte_unused void *dummy)
> >         lcore_id = rte_lcore_id();
> >         qconf = &lcore_conf[lcore_id];
> >
> > -       if (qconf->n_rx_queue == 0) {
> > +       uint16_t n_rx_q = qconf->n_rx_queue;
> > +       uint16_t n_tx_p = qconf->n_tx_port;
> 
> How about adding const?

Ack. The values are not expected to be changed.
Will update in next version.

  reply	other threads:[~2021-04-14  6:02 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-18 10:25 [dpdk-dev] [PATCH 0/4] l3fwd improvements Ruifeng Wang
2021-03-18 10:25 ` [dpdk-dev] [PATCH 1/4] examples/l3fwd: tune prefetch for better performance Ruifeng Wang
2021-04-13 18:50   ` Jerin Jacob
2021-04-13 20:00     ` Honnappa Nagarahalli
2021-05-19  7:52     ` Ruifeng Wang
2021-03-18 10:25 ` [dpdk-dev] [PATCH 2/4] examples/l3fwd: eliminate unnecessary calculations Ruifeng Wang
2021-04-13 18:40   ` Jerin Jacob
2021-03-18 10:25 ` [dpdk-dev] [PATCH 3/4] examples/l3fwd: eliminate unnecessary reloads in loop Ruifeng Wang
2021-04-13 17:43   ` Jerin Jacob
2021-04-14  6:02     ` Ruifeng Wang [this message]
2021-03-18 10:25 ` [dpdk-dev] [PATCH 4/4] examples/l3fwd: make data struct to be memory efficient Ruifeng Wang
2021-04-13 19:06   ` Jerin Jacob
2021-04-21  5:22     ` Hemant Agrawal
2021-04-26 10:55       ` Walsh, Conor
2021-04-27  1:19         ` Ruifeng Wang
2021-04-13  8:24 ` [dpdk-dev] [PATCH 0/4] l3fwd improvements Ruifeng Wang
2021-04-13 17:33   ` Jerin Jacob
2021-04-16  9:39 ` Ling, WeiX
2021-06-01  7:56 ` [dpdk-dev] [PATCH v2 0/3] " Ruifeng Wang
2021-06-01  7:56   ` [dpdk-dev] [PATCH v2 1/3] examples/l3fwd: reorganize code for better performance Ruifeng Wang
2021-06-06 18:34     ` Jerin Jacob
2021-06-01  7:56   ` [dpdk-dev] [PATCH v2 2/3] examples/l3fwd: eliminate unnecessary calculations Ruifeng Wang
2021-06-01  7:56   ` [dpdk-dev] [PATCH v2 3/3] examples/l3fwd: eliminate unnecessary reloads in loop Ruifeng Wang
2021-06-06 18:39     ` Jerin Jacob
2021-06-10  6:57 ` [dpdk-dev] [PATCH v3 0/2] l3fwd improvements Ruifeng Wang
2021-06-10  6:57   ` [dpdk-dev] [PATCH v3 1/2] examples/l3fwd: eliminate unnecessary calculations Ruifeng Wang
2021-06-10  6:57   ` [dpdk-dev] [PATCH v3 2/2] examples/l3fwd: eliminate unnecessary reloads in loop Ruifeng Wang
2021-07-05  8:36   ` [dpdk-dev] [PATCH v3 0/2] l3fwd improvements David Marchand

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