netdev - Re: [PATCH iwl-next v2] igb: Convert Tx timestamping to PTP aux worker

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Message-ID: <87o6s3oivk.fsf@jax.kurt.home>
Date: Mon, 25 Aug 2025 11:22:55 +0200
From: Kurt Kanzenbach <kurt@...utronix.de>
To: Miroslav Lichvar <mlichvar@...hat.com>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Tony Nguyen
 <anthony.l.nguyen@...el.com>, Przemek Kitszel
 <przemyslaw.kitszel@...el.com>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
 <pabeni@...hat.com>, Richard Cochran <richardcochran@...il.com>, Vinicius
 Costa Gomes <vinicius.gomes@...el.com>, Paul Menzel
 <pmenzel@...gen.mpg.de>, Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
 Jacob Keller <jacob.e.keller@...el.com>, intel-wired-lan@...ts.osuosl.org,
 netdev@...r.kernel.org
Subject: Re: [PATCH iwl-next v2] igb: Convert Tx timestamping to PTP aux worker

On Mon Aug 25 2025, Miroslav Lichvar wrote:
> On Sat, Aug 23, 2025 at 09:29:36AM +0200, Kurt Kanzenbach wrote:
>> Also I couldn't really see a performance degradation with ntpperf.
>
> I was testing with an I350, not I210. Could that make a difference?

Jup, it could make a difference.

>
>> In my
>> tests the IRQ variant reached an equal or higher rate. But sometimes I
>> get 'Could not send requests at rate X'. No idea what that means.
>
> That's ntpperf giving up as the HW is too slow to send requests at
> that rate (with a single process calling sendmmsg() in a loop). You
> can add the -l option to force ntpperf to continue, but the printed
> rate values will no longer be accurate, you would need to measure it
> by some other way, e.g. by monitoring the interface packet counters.

I see.

Thanks,
Kurt

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