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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Gokul Bargaje <gokulbargaje.182009@nitk.edu.in>,
	dev@dpdk.org, users@dpdk.org
Subject: Re: [dpdk-dev] [dpdk-users] What is the 'unit of timestamp' assigned to mbuf packet in DPDK?
Date: Fri, 22 Nov 2019 14:48:34 +0000
Message-ID: <6a0d3205-e506-c0cb-3482-3224b875c650@intel.com> (raw)
In-Reply-To: <CAH1-=xgrUZkQoq05Dw+=CQ7wH7NZB5QkSjneXgB_9fAJRcFMhQ@mail.gmail.com>

On 11/18/2019 2:29 PM, Gokul Bargaje wrote:
> Hi,
> 
> The timestamp assigned to packet at the time of enqueue (value of timestamp
> field in mbuf), is it in milliseconds or microseconds or in cpu cycles?

The unit is not defined [1]. 'rte_eth_read_clock()' was added [2] to help
converting it to time when it is clock counter.

[1]
918ae9dc775e ("mbuf: add a timestamp field")

[2]
5e741377657c ("ethdev: add API to read device clock")

> 
> How this timestamp is calculated? Is it calculated using the *rte_cycles.h*?
> 






  reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-18 14:29 [dpdk-dev] " Gokul Bargaje
2019-11-22 14:48 ` Ferruh Yigit [this message]
2019-11-22 17:00   ` [dpdk-dev] [dpdk-users] " Gokul Bargaje
2019-11-22 17:05     ` Stephen Hemminger
2019-11-27 14:49     ` Tom Barbette
2019-11-28  8:28     ` Harman Kalra
2019-11-25 10:56 ` Archit Pandey

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