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From: Gavin Hu <Gavin.Hu@arm.com>
To: Jerin Jacob <jerinjacobk@gmail.com>
Cc: dpdk-dev <dev@dpdk.org>, nd <nd@arm.com>,
	David Marchand <david.marchand@redhat.com>,
	"thomas@monjalon.net" <thomas@monjalon.net>,
	"jerinj@marvell.com" <jerinj@marvell.com>,
	"Ye, Xiaolong" <xiaolong.ye@intel.com>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	 Ruifeng Wang <Ruifeng.Wang@arm.com>,
	Phil Yang <Phil.Yang@arm.com>, Joyce Kong <Joyce.Kong@arm.com>,
	Steve Capper <Steve.Capper@arm.com>, nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH v1 3/3] net/i40e: auto-vectorization to speed up Tx free
Date: Mon, 9 Mar 2020 09:23:22 +0000
Message-ID: <VI1PR08MB53761809403F96D181FAAD878FFE0@VI1PR08MB5376.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <CALBAE1Mtvs60KpxvLRBg82h4Uy5_-Rb6S=gdd95qGPS7prsK=w@mail.gmail.com>

Hi Jerin,

> -----Original Message-----
> From: Jerin Jacob <jerinjacobk@gmail.com>
> Sent: Monday, March 9, 2020 3:36 PM
> To: Gavin Hu <Gavin.Hu@arm.com>
> Cc: dpdk-dev <dev@dpdk.org>; nd <nd@arm.com>; David Marchand
> <david.marchand@redhat.com>; thomas@monjalon.net; jerinj@marvell.com;
> Ye, Xiaolong <xiaolong.ye@intel.com>; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; Ruifeng Wang
> <Ruifeng.Wang@arm.com>; Phil Yang <Phil.Yang@arm.com>; Joyce Kong
> <Joyce.Kong@arm.com>; Steve Capper <Steve.Capper@arm.com>
> Subject: Re: [dpdk-dev] [PATCH v1 3/3] net/i40e: auto-vectorization to speed
> up Tx free
> 
> On Sat, Mar 7, 2020 at 8:34 PM Gavin Hu <Gavin.Hu@arm.com> wrote:
> >
> > Hi Jerin,
> >
> > > -----Original Message-----
> > > From: Jerin Jacob <jerinjacobk@gmail.com>
> > > Sent: Friday, March 6, 2020 3:45 PM
> > > To: Gavin Hu <Gavin.Hu@arm.com>
> > > Cc: dpdk-dev <dev@dpdk.org>; nd <nd@arm.com>; David Marchand
> > > <david.marchand@redhat.com>; thomas@monjalon.net;
> > > jerinj@marvell.com; Ye, Xiaolong <xiaolong.ye@intel.com>; Honnappa
> > > Nagarahalli <Honnappa.Nagarahalli@arm.com>; Ruifeng Wang
> > > <Ruifeng.Wang@arm.com>; Phil Yang <Phil.Yang@arm.com>; Joyce Kong
> > > <Joyce.Kong@arm.com>; Steve Capper <Steve.Capper@arm.com>
> > > Subject: Re: [dpdk-dev] [PATCH v1 3/3] net/i40e: auto-vectorization to
> > > speed up Tx free
> > >
> > > On Fri, Mar 6, 2020 at 10:35 AM Gavin Hu <gavin.hu@arm.com> wrote:
> > > >
> > > > Tx mbuf free is a hotspot for i40e on aarch64, as there are no
> > > > inter-loop dependencies, it is safe to enable auto-vectorization
> > > > to speed up.
> > > >
> > > > This patch showed 2~3% performance lift on ThunderX2 and no
> > > degradation
> > > > on Arm N1SDP. The test case is single core RFC2544 zero-loss test.
> > > >
> > > > Signed-off-by: Gavin Hu <gavin.hu@arm.com>
> > > > Reviewed-by: Steve Capper <steve.capper@arm.com>
> > > > ---
> > > >  drivers/net/i40e/i40e_rxtx_vec_common.h | 5 +++++
> > > >  1 file changed, 5 insertions(+)
> > > >
> > > > diff --git a/drivers/net/i40e/i40e_rxtx_vec_common.h
> > > b/drivers/net/i40e/i40e_rxtx_vec_common.h
> > > > index 0e6ffa007..fc0fa45d4 100644
> > > > --- a/drivers/net/i40e/i40e_rxtx_vec_common.h
> > > > +++ b/drivers/net/i40e/i40e_rxtx_vec_common.h
> > > > @@ -98,6 +98,11 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
> > > >         if (likely(m != NULL)) {
> > > >                 free[0] = m;
> > > >                 nb_free = 1;
> > > > +#if defined(__clang__)
> > > > +#pragma clang loop vectorize(assume_safety)
> > > > +#elif defined(__GNUC__)
> > > > +#pragma GCC ivdep
> > > > +#endif
> > >
> > > IMO, It is better to abstract the compiler features  (above compiler
> > > feature and __restrict__) as macros in
> > > rte_common.h or so. It will help to support other compilers(ICC or
> > > Windows) and enable them to have "changes" in one place.
> >
> > How about defining RTE_LOOP_AUTO_VECTORIZATION in the
> rte_common.h?
> 
> Other compiler stuff in rte_common.h are starting with __rte in small
> letter(__rte_packed, __rte_unused) etc.
> I think, a better name would be __rte_loop_auto_vectorize or so.
> No strong opinion for the name though.
> 
> # Probably it is worth checking and add performance result of x86
> testing in git commit as well as it
> is common code.
Okay, I will do it. 
> 
> 
> > #if defined(__clang__)
> >         define RTE_LOOP_AUTO_VECTORIZATION  \
> >                 #pragma clang loop vectorize(assume_safety)
> > #elif defined(__GNUC__)
> >         define RTE_LOOP_AUTO_VECTORIZATION  \
> >                 #pragma GCC ivdep
> > #else
> >         define RTE_LOOP_AUTO_VECTORIZATION
> > #endif
> > If you agree, I will submit a v2. Thanks for your comments!
> > /Gavin
> > >
> > >
> > >
> > > >                 for (i = 1; i < n; i++) {
> > > >                         m = rte_pktmbuf_prefree_seg(txep[i].mbuf);
> > > >                         if (likely(m != NULL)) {
> > > > --
> > > > 2.17.1
> > > >

  reply	other threads:[~2020-03-09  9:23 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-06  5:04 [dpdk-dev] [PATCH v1 0/3] i40e vPMD optimization on aarch64 Gavin Hu
2020-03-06  5:04 ` [dpdk-dev] [PATCH v1 1/3] net/i40e: relax barrier in the Tx fastpath of vPMD Gavin Hu
2020-03-06  9:11   ` Jerin Jacob
2020-03-06  5:04 ` [dpdk-dev] [PATCH v1 2/3] net/i40e: restrict pointer aliasing for neon vec Gavin Hu
2020-03-06  5:04 ` [dpdk-dev] [PATCH v1 3/3] net/i40e: auto-vectorization to speed up Tx free Gavin Hu
2020-03-06  7:44   ` Jerin Jacob
2020-03-06  9:06     ` Thomas Monjalon
2020-03-07 15:03     ` Gavin Hu
2020-03-09  7:35       ` Jerin Jacob
2020-03-09  9:23         ` Gavin Hu [this message]
2020-04-13 15:56 ` [dpdk-dev] [PATCH v2 0/2] i40e NEON vPMD optimization on aarch64 Gavin Hu
2020-04-13 15:56 ` [dpdk-dev] [PATCH v2 1/2] net/i40e: relax barrier in Tx fastpath for NEON vPMD Gavin Hu
2020-04-13 15:56 ` [dpdk-dev] [PATCH v2 2/2] net/i40e: restrict pointer aliasing " Gavin Hu
2020-04-20 14:51   ` Ferruh Yigit
2020-04-21  9:51     ` Gavin Hu
2020-04-13 16:40 ` [dpdk-dev] [PATCH v3 0/2] i40e NEON vPMD optimization on aarch64 Gavin Hu
2020-04-15  6:50   ` Ye Xiaolong
2020-04-13 16:40 ` [dpdk-dev] [PATCH v3 1/2] net/i40e: relax barrier in Tx fastpath for NEON vPMD Gavin Hu
2020-04-13 16:40 ` [dpdk-dev] [PATCH v3 2/2] net/i40e: restrict pointer aliasing " Gavin Hu

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