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From: blinkin@email.it
To: Thomas Gleixner <tglx@linutronix.de>
Cc: 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 11:52:05 +0200 (CEST)	[thread overview]
Message-ID: <1131544892.7359423.1654854725508.JavaMail.zimbra@email.it> (raw)

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.

Thanks,

        tglx

             reply	other threads:[~2022-06-10  9:58 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-10  9:52 blinkin [this message]
2022-06-10 13:17 ` Bug report for kernel v4.15-rc8+ Rafael J. Wysocki
  -- strict thread matches above, loose matches on Subject: below --
2021-12-17 13:31 blinkin
     [not found] <629765464.1655403.1628264743080.JavaMail.zimbra@email.it>
     [not found] ` <87tujxssp2.ffs@tglx>
     [not found]   ` <217397770.2008922.1628604301644.JavaMail.zimbra@email.it>
     [not found]     ` <877dgtql9v.ffs@tglx>
     [not found]       ` <1437097118.2114098.1628689870926.JavaMail.zimbra@email.it>
2021-08-11 14:20         ` Thomas Gleixner
2021-09-24 10:23           ` blinkin

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