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From: Bruce Richardson <bruce.richardson@intel.com>
To: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Cc: Jianbo Liu <jianbo.liu@linaro.org>,
	dev@dpdk.org, helin.zhang@intel.com,
	konstantin.ananyev@intel.com
Subject: Re: [dpdk-dev] [PATCH v3 2/4] ixgbe: implement vector PMD for arm architecture
Date: Wed, 25 May 2016 13:53:33 +0100	[thread overview]
Message-ID: <20160525125332.GA8612@bricha3-MOBL3> (raw)
In-Reply-To: <20160525122935.GA30670@localhost.localdomain>

On Wed, May 25, 2016 at 05:59:38PM +0530, Jerin Jacob wrote:
> On Fri, May 06, 2016 at 11:55:46AM +0530, Jianbo Liu wrote:
> > use ARM NEON intrinsic to implement ixgbe vPMD
> > 
> > Signed-off-by: Jianbo Liu <jianbo.liu@linaro.org>
> > ---
> >  drivers/net/ixgbe/Makefile              |   4 +
> >  drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c | 561 ++++++++++++++++++++++++++++++++
> >  2 files changed, 565 insertions(+)
> >  create mode 100644 drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c
> > 
<snip>
> > +	for (pos = 0, nb_pkts_recd = 0; pos < nb_pkts;
> > +			pos += RTE_IXGBE_DESCS_PER_LOOP,
> > +			rxdp += RTE_IXGBE_DESCS_PER_LOOP) {
> > +		uint64x2_t descs[RTE_IXGBE_DESCS_PER_LOOP];
> > +		uint8x16_t pkt_mb1, pkt_mb2, pkt_mb3, pkt_mb4;
> > +		uint8x16x2_t sterr_tmp1, sterr_tmp2;
> > +		uint64x2_t mbp1, mbp2;
> > +		uint8x16_t staterr;
> > +		uint16x8_t tmp;
> > +		uint32_t stat;
> > +
> > +		/* B.1 load 1 mbuf point */
> > +		mbp1 = vld1q_u64((uint64_t *)&sw_ring[pos]);
> > +
> > +		/* Read desc statuses backwards to avoid race condition */
> > +		/* A.1 load 4 pkts desc */
> > +		descs[3] =  vld1q_u64((uint64_t *)(rxdp + 3));
> > +		rte_rmb();
> 
> Any specific reason to add rte_rmb() here, If there is no performance
> drop then it makes sense to add before descs[3] uses it.i.e
> at rte_compiler_barrier() place in x86 code.
> 
> > +
> > +		/* B.2 copy 2 mbuf point into rx_pkts  */
> > +		vst1q_u64((uint64_t *)&rx_pkts[pos], mbp1);
> > +
> > +		/* B.1 load 1 mbuf point */
> > +		mbp2 = vld1q_u64((uint64_t *)&sw_ring[pos + 2]);
> > +
> > +		descs[2] =  vld1q_u64((uint64_t *)(rxdp + 2));
> > +		/* B.1 load 2 mbuf point */
> > +		descs[1] =  vld1q_u64((uint64_t *)(rxdp + 1));
> > +		descs[0] =  vld1q_u64((uint64_t *)(rxdp));
> > +
> > +		/* B.2 copy 2 mbuf point into rx_pkts  */
> > +		vst1q_u64((uint64_t *)&rx_pkts[pos + 2], mbp2);
> > +
> > +		if (split_packet) {
> > +			rte_prefetch_non_temporal(&rx_pkts[pos]->cacheline1);
> > +			rte_prefetch_non_temporal(&rx_pkts[pos+1]->cacheline1);
> > +			rte_prefetch_non_temporal(&rx_pkts[pos+2]->cacheline1);
> > +			rte_prefetch_non_temporal(&rx_pkts[pos+3]->cacheline1);
> 
> replace with rte_mbuf_prefetch_part2 or equivalent
> 
Hi Jerin, Jianbo,

since this patch has already been applied and these are not critical issues with
it, can a new patch please be submitted to propose these additional changes on
top of what's on next-net now.

Thanks,
/Bruce

  reply	other threads:[~2016-05-25 12:53 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-20 13:44 [dpdk-dev] [PATCH 1/4] ixgbe: rearrange vector PMD code for x86 Jianbo Liu
2016-04-20 13:45 ` [dpdk-dev] [PATCH 2/4] ixgbe: implement vector PMD for arm architecture Jianbo Liu
2016-04-20 13:45 ` [dpdk-dev] [PATCH 3/4] ixgbe: enable ixgbe vector PMD on ARMv8a platform Jianbo Liu
2016-04-20 13:45 ` [dpdk-dev] [PATCH 4/4] maintainers: claim responsibility for ixgbe vector PMD on ARM Jianbo Liu
2016-04-25 16:35 ` [dpdk-dev] [PATCH 1/4] ixgbe: rearrange vector PMD code for x86 Bruce Richardson
2016-04-26  8:23   ` Jianbo Liu
2016-04-26 13:50 ` [dpdk-dev] [PATCH v2 " Jianbo Liu
2016-05-03  5:51   ` Jianbo Liu
2016-05-03 16:29   ` Bruce Richardson
2016-04-26 13:55 ` [dpdk-dev] [PATCH v2 2/4] ixgbe: implement vector PMD for arm architecture Jianbo Liu
2016-04-26 13:55 ` [dpdk-dev] [PATCH v2 3/4] ixgbe: enable ixgbe vector PMD on ARMv8a platform Jianbo Liu
2016-04-26 13:55 ` [dpdk-dev] [PATCH v2 4/4] maintainers: claim responsibility for ixgbe vector PMD on ARM Jianbo Liu
2016-05-06  6:25 ` [dpdk-dev] [PATCH v3 0/4] ixgbe: enable " Jianbo Liu
2016-05-06  6:25   ` [dpdk-dev] [PATCH v3 1/4] ixgbe: rearrange vector PMD code for x86 Jianbo Liu
2016-05-06  6:25   ` [dpdk-dev] [PATCH v3 2/4] ixgbe: implement vector PMD for arm architecture Jianbo Liu
2016-05-10 14:49     ` Bruce Richardson
2016-05-11  2:40       ` Jianbo Liu
2016-05-25 12:29     ` Jerin Jacob
2016-05-25 12:53       ` Bruce Richardson [this message]
2016-05-26  1:37       ` Jianbo Liu
2016-05-06  6:25   ` [dpdk-dev] [PATCH v3 3/4] ixgbe: enable ixgbe vector PMD on ARMv8a platform Jianbo Liu
2016-05-06  6:25   ` [dpdk-dev] [PATCH v3 4/4] maintainers: claim responsibility for ixgbe vector PMD on ARM Jianbo Liu
2016-05-24 16:10   ` [dpdk-dev] [PATCH v3 0/4] ixgbe: enable " Bruce Richardson
2016-05-24 16:12     ` Bruce Richardson
2016-05-27 10:44       ` Jianbo Liu

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