From: Kurt Kanzenbach <kurt@linutronix.de>
To: "Marc Strämke" <marc.straemke@eltropuls.de>,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org
Subject: Re: Latency spikes on V6.15.1 Preempt RT and maybe related to intel? IGB
Date: Tue, 17 Jun 2025 15:35:03 +0200 [thread overview]
Message-ID: <87plf27apk.fsf@jax.kurt.home> (raw)
In-Reply-To: <19a46896-3d26-415b-9820-730a42b0702e@eltropuls.de>
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On Tue Jun 17 2025, Marc Strämke wrote:
> Hi Kurt,
> On 17.06.25 12:54, Kurt Kanzenbach wrote:
>>> 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
>
> This works wonders (Latency spike down to 120 us from 700) ! I will
> prepare a patch and submit it to LKML.
Great :-)
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next prev parent reply other threads:[~2025-06-17 13:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-10 11:23 Latency spikes on V6.15.1 Preempt RT and maybe related to intel IGB Marc Strämke
2025-06-13 14:54 ` Sebastian Andrzej Siewior
[not found] ` <E1uQ6I0-000000003aa-37uJ@smtprelay05.ispgateway.de>
2025-06-13 19:58 ` Latency spikes on V6.15.1 Preempt RT and maybe related to intel? IGB Sebastian Andrzej Siewior
2025-06-14 8:52 ` Marc Strämke
2025-06-16 15:10 ` Marc Strämke
2025-06-17 9:16 ` Sebastian Andrzej Siewior
2025-06-17 9:08 ` Sebastian Andrzej Siewior
2025-06-17 9:28 ` Sebastian Andrzej Siewior
2025-06-17 9:45 ` Marc Strämke
2025-06-17 10:00 ` Sebastian Andrzej Siewior
2025-06-17 10:03 ` Marc Strämke
2025-06-17 10:15 ` Sebastian Andrzej Siewior
2025-06-17 10:54 ` Kurt Kanzenbach
[not found] ` <19a46896-3d26-415b-9820-730a42b0702e@eltropuls.de>
2025-06-17 13:35 ` Kurt Kanzenbach [this message]
[not found] ` <522704b0-5a35-42c3-9bcc-627b487b740c@eltropuls.de>
2025-06-14 18:13 ` Latency spikes on V6.15.1 Preempt RT and maybe related to intel IGB Sebastian Andrzej Siewior
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