From: Stephen Hemminger <stephen@networkplumber.org>
To: Dpdk Newbie <dpdkuser77@gmail.com>
Cc: dev@dpdk.org
Subject: Re: Does DPDK provide RX timestamps?
Date: Sun, 8 Sep 2024 17:13:55 -0700 [thread overview]
Message-ID: <20240908171355.264071b2@hermes.local> (raw)
In-Reply-To: <CAJgPhro2CF2gzouZmz0seKDzNej540GzuA_UyCGpG_zZT2gCwA@mail.gmail.com>
On Sun, 8 Sep 2024 23:31:36 +0100
Dpdk Newbie <dpdkuser77@gmail.com> wrote:
> 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,
Depends on the hardware, and the dynamic field for rx timestamp
also varies in its clock value. Some are ticks, some are us, some are ns;
and the base is arbitrary so difficult to use for packet capture.
next prev parent reply other threads:[~2024-09-09 0:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-08 22:31 Dpdk Newbie
2024-09-09 0:13 ` Stephen Hemminger [this message]
2024-09-09 8:23 ` fengchengwen
[not found] ` <8a180c35-c4fd-4760-a4fa-f7d3ff360fab@email.android.com>
[not found] ` <40e44bc0f788441ea70f48a33bef7f59@amazon.com>
2024-09-09 8:31 ` Brandes, Shai
2024-09-09 17:54 ` Dpdk Newbie
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