From: "Rafael J. Wysocki" <rafael@kernel.org>
To: blinkin@email.it
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Len Brown <lenb@kernel.org>,
linux-acpi <linux-acpi@vger.kernel.org>
Subject: Re: Bug report for kernel v4.15-rc8+
Date: Fri, 10 Jun 2022 15:17:51 +0200 [thread overview]
Message-ID: <CAJZ5v0jwdxOFME0NiCmTUO9pxZb5QKZ8ZAcAF10jQqzxkqpT6g@mail.gmail.com> (raw)
In-Reply-To: <1131544892.7359423.1654854725508.JavaMail.zimbra@email.it>
On Fri, Jun 10, 2022 at 11:52 AM <blinkin@email.it> wrote:
>
> hello, any news on this?
>
> ----- Messaggio originale -----
> Da: "Thomas Gleixner" <tglx@linutronix.de>
> A: blinkin@email.it
> Cc: "linux-kernel" <linux-kernel@vger.kernel.org>, "Rafael J. Wysocki" <rafael@kernel.org>, "Len Brown" <lenb@kernel.org>, linux-acpi@vger.kernel.org
> Inviato: Mercoledì, 11 agosto 2021 16:20:41
> Oggetto: Re: Bug report for kernel v4.15-rc8+
>
> On Wed, Aug 11 2021 at 15:51, blinkin@email.it wrote:
> > 1) You're booting with an out of tree module
> >
> > Uninstalled virtualbox, reproduced same behavior without the module.
> > dmesg outputs attached with and without the workaround
> > (dmesg_novboxdrv_clean.txt and dmesg_novboxdrv_irqaffinity0.txt)
>
> Ok.
>
> > 2) Please provide information what is consuming 90% of a CPU
> >
> > top shows a kworker process consistently at 50% without the
> > workaround, 60% with the workaround. No significant activity amounts
> > from other processes. Sometimes that 50% is split between two
> > kworker processes for a short time. CPU core #0 activity is a
> > constant 60% without the workaround, 90% with the workaround
>
> That's broken. /proc/interrupts gives some hint:
>
> 1) Stock kernel
>
> > CPU0 CPU1 CPU2 CPU3
> > 0: 10 0 0 0 IR-IO-APIC 2-edge timer
> > 1: 0 0 0 9 IR-IO-APIC 1-edge i8042
> > 8: 0 1 0 0 IR-IO-APIC 8-edge rtc0
> > 9: 0 923411 0 0 IR-IO-APIC 9-fasteoi acpi
>
> 900k ACPI interrupts right after boot
>
> > CPU0 CPU1 CPU2 CPU3
> > 0: 10 0 0 0 IR-IO-APIC 2-edge timer
> > 1: 0 0 0 11 IR-IO-APIC 1-edge i8042
> > 8: 0 1 0 0 IR-IO-APIC 8-edge rtc0
> > 9: 0 4869059 0 0 IR-IO-APIC 9-fasteoi acpi
>
> One minute later it's 4.8M
>
> With affinity forced to CPU0 it's even more:
>
> > CPU0 CPU1 CPU2 CPU3
> > 0: 10 0 0 0 IR-IO-APIC 2-edge timer
> > 1: 9 0 0 0 IR-IO-APIC 1-edge i8042
> > 8: 1 0 0 0 IR-IO-APIC 8-edge rtc0
> > 9: 7576456 0 0 0 IR-IO-APIC 9-fasteoi acpi
>
> 7.5M right after boot
>
> > CPU0 CPU1 CPU2 CPU3
> > 0: 10 0 0 0 IR-IO-APIC 2-edge timer
> > 1: 11 0 0 0 IR-IO-APIC 1-edge i8042
> > 8: 1 0 0 0 IR-IO-APIC 8-edge rtc0
> > 9: 10992420 0 0 0 IR-IO-APIC 9-fasteoi acpi
>
> 10.9M after one minute. Though the delta between right after boot and 1
> minute later is in the same ballpark.
>
> Cc'ed the ACPI people for clues.
Looks like a GPE storm to me.
I would look into /sys/firmware/acpi/interrupts/* for hints.
next prev parent reply other threads:[~2022-06-10 13:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-10 9:52 Bug report for kernel v4.15-rc8+ blinkin
2022-06-10 13:17 ` Rafael J. Wysocki [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-12-17 13:31 blinkin
2021-08-06 15:45 blinkin
2021-08-10 6:46 ` Thomas Gleixner
2021-08-10 14:05 ` blinkin
2021-08-10 17:09 ` Thomas Gleixner
2021-08-11 13:51 ` blinkin
2021-08-11 14:20 ` Thomas Gleixner
2021-09-24 10:23 ` blinkin
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