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From: Thomas Monjalon <thomas@monjalon.net>
To: Pavan Nikhilesh Bhagavatula <pbhagavatula@marvell.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	Marko Kovacevic <marko.kovacevic@intel.com>,
	Ori Kam <orika@mellanox.com>,
	Bruce Richardson <bruce.richardson@intel.com>,
	Pablo de Lara <pablo.de.lara.guarch@intel.com>,
	Radu Nicolau <radu.nicolau@intel.com>,
	Akhil Goyal <akhil.goyal@nxp.com>,
	Tomasz Kantecki <tomasz.kantecki@intel.com>,
	"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] examples/l3fwd: fix em mode datapath selection
Date: Tue, 23 Apr 2019 10:35:22 +0200	[thread overview]
Message-ID: <1979146.r4zusaNbqz@xps> (raw)
In-Reply-To: <CY4PR1801MB1863BE0AC91529A0E33984EADE230@CY4PR1801MB1863.namprd18.prod.outlook.com>

23/04/2019 04:47, Pavan Nikhilesh Bhagavatula:
>From: Thomas Monjalon <thomas@monjalon.net>
> >10/04/2019 09:29, Pavan Nikhilesh Bhagavatula:
> >> From: Pavan Nikhilesh <pbhagavatula@marvell.com>
> >>
> >> Currently, l3wfd em mode has two datapath modes em_sequential and
> >> em_hlm. We can select either of them by defining
> >NO_HASH_MULTI_LOOKUP
> >> to one or zero.
> >> The code checks if NO_HASH_MULTI_LOOKUP is defined or not instead of
> >> checking for the value.
> >>
> >> Fixes: 52c97adc1f0f ("examples/l3fwd: fix exact match performance")
> >> Cc: stable@dpdk.org
> >>
> >> Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
> >> ---
> >> --- a/examples/l3fwd/l3fwd_em.c
> >> +++ b/examples/l3fwd/l3fwd_em.c
> >>  #if defined RTE_ARCH_X86 || defined RTE_MACHINE_CPUFLAG_NEON -#if
> >> defined(NO_HASH_MULTI_LOOKUP)
> >> +#if NO_HASH_MULTI_LOOKUP
> >
> >A quick grep shows that it used in another place with #ifdef:
> >
> >examples/l3fwd/l3fwd.h:#if !defined(NO_HASH_MULTI_LOOKUP) &&
> >defined(RTE_MACHINE_CPUFLAG_NEON)
> >
> >
> 
> #if !defined(NO_HASH_MULTI_LOOKUP) && defined(RTE_MACHINE_CPUFLAG_NEON)
> #define NO_HASH_MULTI_LOOKUP 1
> #endif
> 
> This macro is used to set l3fwd_em_sequential as the default EM datapath on AARCH64 
> as its performance is better. (http://patches.dpdk.org/patch/49372/)
> 
> make -C examples/l3fwd           #Selects l3fwd_em_sequential by default on AARCH 64 
> 
> Currently, we cannot select em_hlm without manually editing the macro as using the below command still
> sets em_sequential as the default datapath because the macro modified in the patch that selects the datapath 
> checks if NO_HASH_MULTI_LOOKUP is defined or not rather than its value.
> 
> EXTRA_CFLAGS='-DNO_HASH_MULTI_LOOKUP=0' make -C examples/l3fwd
> 
> I hope I cleared up things a bit.

In my understanding, we should check the value in the other case too,
instead of #if defined.

  parent reply	other threads:[~2019-04-23  8:35 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-10  7:29 Pavan Nikhilesh Bhagavatula
2019-04-10  7:29 ` Pavan Nikhilesh Bhagavatula
2019-04-22 21:20 ` Thomas Monjalon
2019-04-22 21:20   ` Thomas Monjalon
2019-04-23  2:47   ` Pavan Nikhilesh Bhagavatula
2019-04-23  2:47     ` Pavan Nikhilesh Bhagavatula
2019-04-23  8:35     ` Thomas Monjalon [this message]
2019-04-23  8:35       ` Thomas Monjalon
2019-04-23  9:12       ` Pavan Nikhilesh Bhagavatula
2019-04-23  9:12         ` Pavan Nikhilesh Bhagavatula
2019-04-24  2:59         ` Ruifeng Wang (Arm Technology China)
2019-04-24  2:59           ` Ruifeng Wang (Arm Technology China)
2019-05-02 23:32 ` Thomas Monjalon
2019-05-02 23:32   ` Thomas Monjalon

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