From: "Yao, Lei A" <lei.a.yao@intel.com>
To: Jianbo Liu <jianbo.liu@linaro.org>
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 03:26:25 +0000 [thread overview]
Message-ID: <2DBBFF226F7CF64BAFCA79B681719D9502046341@shsmsx102.ccr.corp.intel.com> (raw)
In-Reply-To: <82F45D86ADE5454A95A89742C8D1410E0330A4B6@shsmsx102.ccr.corp.intel.com>
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.
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 3:26 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 [this message]
2016-08-03 6:02 ` Jianbo Liu
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
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