From: Jianbo Liu <jianbo.liu@linaro.org>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: Jerin Jacob <jerin.jacob@caviumnetworks.com>,
dev@dpdk.org, "Zhang, Helin" <helin.zhang@intel.com>,
"Ananyev, Konstantin" <konstantin.ananyev@intel.com>
Subject: Re: [dpdk-dev] [PATCH 2/2] net/ixgbe: calculate correct number of received packets for ARM NEON-version vPMD
Date: Thu, 22 Dec 2016 09:18:12 +0800 [thread overview]
Message-ID: <CAP4Qi38KtF7gKdoBvo9Np=WxoGarfTb-TxSgexLQcAUeHAEbcA@mail.gmail.com> (raw)
In-Reply-To: <20161221110331.GA9108@bricha3-MOBL3.ger.corp.intel.com>
On 21 December 2016 at 19:03, Bruce Richardson
<bruce.richardson@intel.com> wrote:
> On Wed, Dec 21, 2016 at 03:38:51PM +0530, Jerin Jacob wrote:
>> On Mon, Dec 19, 2016 at 11:39:18AM +0530, Jianbo Liu wrote:
>>
>> Hi Jianbo,
>>
>> > vPMD will check 4 descriptors in one time, but the statuses are not consistent
>> > because the memory allocated for RX descriptors is cacheable huagepage.
>> Is it different in X86 case ?i.e Is x86 creating non cacheable hugepages?
>
> This is not a problem on IA, because the instruction ordering rules on
> IA guarantee that the reads will be done in the correct program order,
> and we never get stale cache data.
>
Yes, I think it's an issue for ARM arch.
It's because more than one cacheline-sized data (4/8 descriptors can
be in two cachelines) will be read at one time in bulk alloc RX or
vPMD.
There is the same issue for i40e, I'll send the same patch later.
next prev parent reply other threads:[~2016-12-22 1:18 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-19 6:09 [dpdk-dev] [PATCH 1/2] net/ixgbe: calculate the correct number of received packets in bulk alloc function Jianbo Liu
2016-12-19 6:09 ` [dpdk-dev] [PATCH 2/2] net/ixgbe: calculate correct number of received packets for ARM NEON-version vPMD Jianbo Liu
2016-12-21 10:08 ` Jerin Jacob
2016-12-21 11:03 ` Bruce Richardson
2016-12-22 1:18 ` Jianbo Liu [this message]
2016-12-22 1:05 ` Jianbo Liu
2017-02-01 16:19 ` [dpdk-dev] [PATCH 1/2] net/ixgbe: calculate the correct number of received packets in bulk alloc function Ananyev, Konstantin
2017-02-03 6:22 ` Jianbo Liu
2017-02-03 11:38 ` Ananyev, Konstantin
2017-02-04 3:37 ` Jianbo Liu
2017-02-04 9:37 ` [dpdk-dev] [PATCH v2 " Jianbo Liu
2017-02-04 9:37 ` [dpdk-dev] [PATCH v2 2/2] net/ixgbe: calculate correct number of received packets for ARM NEON-version vPMD Jianbo Liu
2017-02-04 13:26 ` [dpdk-dev] [PATCH v2 1/2] net/ixgbe: calculate the correct number of received packets in bulk alloc function Ananyev, Konstantin
2017-02-08 18:02 ` Ferruh Yigit
2017-02-08 18:53 ` Ananyev, Konstantin
2017-02-08 19:53 ` Ananyev, Konstantin
2017-02-09 3:49 ` Jianbo Liu
2017-02-04 16:37 ` [dpdk-dev] [PATCH v3 " Jianbo Liu
2017-02-04 16:37 ` [dpdk-dev] [PATCH v3 2/2] net/ixgbe: calculate correct number of received packets for ARM NEON-version vPMD Jianbo Liu
2017-02-04 16:39 ` [dpdk-dev] [PATCH v3 1/2] net/ixgbe: calculate the correct number of received packets in bulk alloc function Jianbo Liu
2017-02-09 4:05 ` [dpdk-dev] [PATCH v4 " Jianbo Liu
2017-02-09 4:05 ` [dpdk-dev] [PATCH v4 2/2] net/ixgbe: calculate correct number of received packets for ARM NEON-version vPMD Jianbo Liu
2017-02-09 12:43 ` Ferruh Yigit
2017-02-09 12:39 ` [dpdk-dev] [PATCH v4 1/2] net/ixgbe: calculate the correct number of received packets in bulk alloc function Ferruh Yigit
2017-02-09 12:42 ` Ferruh Yigit
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