linux-kernel - Re: Latency spikes on V6.15.1 Preempt RT and maybe related to intel? IGB

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Message-ID: <87v7ou7i4i.fsf@jax.kurt.home>
Date: Tue, 17 Jun 2025 12:54:53 +0200
From: Kurt Kanzenbach <kurt@...utronix.de>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Marc Strämke
 <marc.straemke@...ropuls.de>
Cc: linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: Latency spikes on V6.15.1 Preempt RT and maybe related to
 intel? IGB

On Tue Jun 17 2025, Sebastian Andrzej Siewior wrote:
> On 2025-06-17 12:03:31 [+0200], Marc Strämke wrote:
>> Anyway: Thanks for your help Sebastian! I can probably live well with these
>> spikes in latency. I was more concerned that there is a deeper issue with my
>> config and the response time could be unbounded.
>
> You don't have to live with it. You could add a read after the writes in
> the loop (wrfl()). This should help.

Something like this, which was done for Intel e1000?

https://lore.kernel.org/intel-wired-lan/20241219192743.4499-1-gerhard@engleder-embedded.com/

Thanks,
Kurt

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