[dpdk-dev] [PATCH] i40e: enable i40e pmd on ARM platform
Ananyev, Konstantin
konstantin.ananyev at intel.com
Wed Aug 3 10:29:06 CEST 2016
Hi Jianbo,
> > Hi, Jianbo
> >
> > I have tested you patch on my X86 platform, the single core performance for Non-vector PMD will have about 1Mpps drop
> > Non-vector PMD single core performance with patch : ~33.9 Mpps
> > Non-vector PMD single core performance without patch : ~35.1 Mpps
> > Is there any way to avoid such performance drop on X86? Thanks.
> >
>
> I think we can place a compiling condition before rte_rmb() to avoid performance decrease on x86.
> For example: #if defined(RTE_ARCH_ARM) || defined(RTE_ARCH_ARM64)
I suppose you can use rte_smp_rmb() here?
Konstantin
>
> Thanks!
> Jianbo
>
> > BRs
> > Lei
> >
> > -----Original Message-----
> > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Jianbo Liu
> > Sent: Tuesday, August 2, 2016 2:58 PM
> > To: dev at dpdk.org; Zhang, Helin <helin.zhang at intel.com>; Wu, Jingjing
> > <jingjing.wu at intel.com>
> > Cc: Jianbo Liu <jianbo.liu at linaro.org>
> > Subject: [dpdk-dev] [PATCH] i40e: enable i40e pmd on ARM platform
> >
> > And add read memory barrier to avoid status inconsistency between two RX descriptors readings.
> >
> > Signed-off-by: Jianbo Liu <jianbo.liu at linaro.org>
> > ---
> > config/defconfig_arm64-armv8a-linuxapp-gcc | 2 +-
> > doc/guides/nics/overview.rst | 2 +-
> > drivers/net/i40e/i40e_rxtx.c | 2 ++
> > 3 files changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/config/defconfig_arm64-armv8a-linuxapp-gcc
> > b/config/defconfig_arm64-armv8a-linuxapp-gcc
> > index 1a17126..08f282b 100644
> > --- a/config/defconfig_arm64-armv8a-linuxapp-gcc
> > +++ b/config/defconfig_arm64-armv8a-linuxapp-gcc
> > @@ -46,6 +46,6 @@ CONFIG_RTE_EAL_IGB_UIO=n
> >
> > CONFIG_RTE_LIBRTE_IVSHMEM=n
> > CONFIG_RTE_LIBRTE_FM10K_PMD=n
> > -CONFIG_RTE_LIBRTE_I40E_PMD=n
> > +CONFIG_RTE_LIBRTE_I40E_INC_VECTOR=n
> >
> > CONFIG_RTE_SCHED_VECTOR=n
> > diff --git a/doc/guides/nics/overview.rst
> > b/doc/guides/nics/overview.rst index 6abbae6..5175591 100644
> > --- a/doc/guides/nics/overview.rst
> > +++ b/doc/guides/nics/overview.rst
> > @@ -138,7 +138,7 @@ Most of these differences are summarized below.
> > Linux VFIO Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y
> > Other kdrv Y Y Y
> > ARMv7 Y Y Y
> > - ARMv8 Y Y Y Y Y Y Y Y
> > + ARMv8 Y Y Y Y Y Y Y Y Y
> > Power8 Y Y Y
> > TILE-Gx Y
> > x86-32 Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y
> > diff --git a/drivers/net/i40e/i40e_rxtx.c
> > b/drivers/net/i40e/i40e_rxtx.c index 554d167..4004b8e 100644
> > --- a/drivers/net/i40e/i40e_rxtx.c
> > +++ b/drivers/net/i40e/i40e_rxtx.c
> > @@ -994,6 +994,8 @@ i40e_rx_scan_hw_ring(struct i40e_rx_queue *rxq)
> > I40E_RXD_QW1_STATUS_SHIFT;
> > }
> >
> > + rte_rmb();
> > +
> > /* Compute how many status bits were set */
> > for (j = 0, nb_dd = 0; j < I40E_LOOK_AHEAD; j++)
> > nb_dd += s[j] & (1 <<
> > I40E_RX_DESC_STATUS_DD_SHIFT);
> > --
> > 2.4.11
> >
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