From: Hemant Agrawal <hemant.agrawal@nxp.com>
To: Jerin Jacob <jerin.jacob@caviumnetworks.com>,
"dev@dpdk.org" <dev@dpdk.org>
Cc: "thomas.monjalon@6wind.com" <thomas.monjalon@6wind.com>,
"jianbo.liu@linaro.org" <jianbo.liu@linaro.org>,
"viktorin@rehivetech.com" <viktorin@rehivetech.com>
Subject: Re: [dpdk-dev] [PATCH] eal/armv8: high-resolution cycle counter
Date: Tue, 23 Aug 2016 10:01:55 +0000 [thread overview]
Message-ID: <DB5PR04MB16052F5FCA2D9C0F0CE7C08989EB0@DB5PR04MB1605.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <1471521090-21067-1-git-send-email-jerin.jacob@caviumnetworks.com>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Jerin Jacob
> Sent: Thursday, August 18, 2016 5:22 PM
> To: dev@dpdk.org
> Cc: thomas.monjalon@6wind.com; jianbo.liu@linaro.org;
> viktorin@rehivetech.com; Jerin Jacob <jerin.jacob@caviumnetworks.com>
> Subject: [dpdk-dev] [PATCH] eal/armv8: high-resolution cycle counter
>
> Existing cntvct_el0 based rte_rdtsc() provides portable means to get wall clock
> counter at user space. Typically it runs at <= 100MHz.
>
> The alternative method to enable rte_rdtsc() for high resolution wall clock
> counter is through armv8 PMU subsystem.
> The PMU cycle counter runs at CPU frequency, However, access to PMU cycle
> counter from user space is not enabled by default in the arm64 linux kernel.
> It is possible to enable cycle counter at user space access by configuring the
> PMU from the privileged mode (kernel space).
>
> by default rte_rdtsc() implementation uses portable
> cntvct_el0 scheme. Application can choose the PMU based implementation with
> CONFIG_RTE_ARM_EAL_RDTSC_USE_PMU
>
> Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
next prev parent reply other threads:[~2016-08-23 10:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-18 11:51 Jerin Jacob
2016-08-19 9:43 ` Nipun Gupta
2016-08-19 11:46 ` Jerin Jacob
2016-08-19 12:24 ` Jan Viktorin
2016-08-19 12:52 ` Jerin Jacob
2016-10-04 8:42 ` Thomas Monjalon
2016-08-23 10:01 ` Hemant Agrawal [this message]
2016-10-04 8:46 ` Thomas Monjalon
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