From: Jianbo Liu <jianbo.liu@linaro.org>
To: "Yao, Lei A" <lei.a.yao@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"Zhang, Helin" <helin.zhang@intel.com>,
"Wu, Jingjing" <jingjing.wu@intel.com>
Subject: Re: [dpdk-dev] [PATCH] i40e: enable i40e pmd on ARM platform
Date: Wed, 3 Aug 2016 14:02:05 +0800 [thread overview]
Message-ID: <CAP4Qi39C0vNSbkOaVapiSGBbt=em7kef9XLP-W3UjDjKMWoTCg@mail.gmail.com> (raw)
In-Reply-To: <2DBBFF226F7CF64BAFCA79B681719D9502046341@shsmsx102.ccr.corp.intel.com>
On 3 August 2016 at 11:26, Yao, Lei A <lei.a.yao@intel.com> wrote:
> 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)
Thanks!
Jianbo
> BRs
> Lei
>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Jianbo Liu
> Sent: Tuesday, August 2, 2016 2:58 PM
> To: dev@dpdk.org; Zhang, Helin <helin.zhang@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>
> Cc: Jianbo Liu <jianbo.liu@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@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
>
next prev parent reply other threads:[~2016-08-03 6:02 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-02 6:58 Jianbo Liu
[not found] ` <82F45D86ADE5454A95A89742C8D1410E0330A4B6@shsmsx102.ccr.corp.intel.com>
2016-08-03 3:26 ` Yao, Lei A
2016-08-03 6:02 ` Jianbo Liu [this message]
2016-08-03 7:58 ` Thomas Monjalon
2016-08-03 9:33 ` Jianbo Liu
2016-08-03 8:29 ` Ananyev, Konstantin
2016-08-03 9:36 ` Jianbo Liu
2016-08-03 10:12 ` [dpdk-dev] [PATCH v2] " Jianbo Liu
2016-08-05 9:06 ` [dpdk-dev] [PATCH v3] " Jianbo Liu
2016-09-23 1:13 ` Zhang, Qi Z
2016-09-27 13:39 ` Bruce Richardson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAP4Qi39C0vNSbkOaVapiSGBbt=em7kef9XLP-W3UjDjKMWoTCg@mail.gmail.com' \
--to=jianbo.liu@linaro.org \
--cc=dev@dpdk.org \
--cc=helin.zhang@intel.com \
--cc=jingjing.wu@intel.com \
--cc=lei.a.yao@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).