netdev - Re: [PATCH v2 0/5] Add support for DMA timestamp for non-PTP packets

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Message-ID: <Y1KVLAR2Qi6JeSBj@hoboy.vegasvil.org>
Date:   Fri, 21 Oct 2022 05:48:44 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     "Zulkifli, Muhammad Husaini" <muhammad.husaini.zulkifli@...el.com>
Cc:     "intel-wired-lan@...osl.org" <intel-wired-lan@...osl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "Gunasekaran, Aravindhan" <aravindhan.gunasekaran@...el.com>,
        "gal@...dia.com" <gal@...dia.com>,
        "saeed@...nel.org" <saeed@...nel.org>,
        "leon@...nel.org" <leon@...nel.org>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        "andy@...yhouse.net" <andy@...yhouse.net>,
        "Gomes, Vinicius" <vinicius.gomes@...el.com>
Subject: Re: [PATCH v2 0/5] Add support for DMA timestamp for non-PTP packets

On Fri, Oct 21, 2022 at 12:25:13AM +0000, Zulkifli, Muhammad Husaini wrote:

> Sorry for misinterpreting SOFTWARE as HARDWARE in my previous reply.
> DMA Timestamping is definitely better than SOFTWARE timestamp because 
> we sample the time at the controller MAC level.

Do you have numbers to back up this claim?

> Could you please provide additional details about this? What do you meant by 
> offering 1 HW Timestamp with many SW timestamps? 

- Let the PTP stack use hardware time stamps.

- Let all other applications use software time stamps.

Hm?

Thanks,
Richard