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From: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
To: Dpdk Newbie <dpdkuser77@gmail.com>
Cc: users@dpdk.org
Subject: Re: Does DPDK provide RX timestamps?
Date: Mon, 9 Sep 2024 02:07:19 +0300	[thread overview]
Message-ID: <20240909020719.4d23c1dd@sovereign> (raw)
In-Reply-To: <CAJgPhrpSBSrvV3C4YkD+AncAoHVBLwoWuDUrjkdE+xwKCXm6YQ@mail.gmail.com>

2024-09-08 23:34 (UTC+0100), Dpdk Newbie:
> Hi. I am using Intel (i210) and AWS ENA network interface cards.
> 
> I would like to measure the following RX latencies:
> 
> 1) NIC to DPDK packet ring buffer
> 2) DPDK packet ring buffer to application via rte_eth_rx_burst.
> 
> I don't mind measuring in nanoseconds or CPU cycles.
> 
> Unfortunately I cannot find any mention of hardware timestamps.
> 
> I found brief references to mbuf containing a timestamp in the dynamic
> fields, but nothing definitive.
> 
> Could someone please clarify what the situation is?
> 
> Thanks,

DPDK only provides API to access Rx timestamp if it's available.
Example: https://elixir.bootlin.com/dpdk/v24.07/source/app/test-pmd/util.c#L37

Rx timestamp availability depends on the PMD and HW.
Support matrix: https://doc.dpdk.org/guides/nics/overview.html
It seems to be no support for i210 (igb?) or AWS ENA (ena).

	

  reply	other threads:[~2024-09-08 23:07 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAJgPhro2CF2gzouZmz0seKDzNej540GzuA_UyCGpG_zZT2gCwA@mail.gmail.com>
2024-09-08 22:34 ` Dpdk Newbie
2024-09-08 23:07   ` Dmitry Kozlyuk [this message]
2024-09-08 23:21     ` Dpdk Newbie

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