From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6B1DC433F5 for ; Fri, 17 Dec 2021 13:36:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232575AbhLQNg6 convert rfc822-to-8bit (ORCPT ); Fri, 17 Dec 2021 08:36:58 -0500 Received: from pout.email.it ([77.93.251.230]:47444 "EHLO pout.email.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231836AbhLQNg5 (ORCPT ); Fri, 17 Dec 2021 08:36:57 -0500 X-Greylist: delayed 336 seconds by postgrey-1.27 at vger.kernel.org; Fri, 17 Dec 2021 08:36:57 EST Received: from localhost (localhost [127.0.0.1]) by pout.email.it (Postfix) with ESMTP id A1680A54BE; Fri, 17 Dec 2021 14:31:19 +0100 (CET) Received: from pout.email.it ([127.0.0.1]) by localhost (ir-mtaout02.email.it [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id om7RZFOX3haw; Fri, 17 Dec 2021 14:31:15 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by pout.email.it (Postfix) with ESMTP id 09633A54BF; Fri, 17 Dec 2021 14:31:15 +0100 (CET) X-Virus-Scanned: amavisd-new at ir-mtaout02.email.it Received: from pout.email.it ([127.0.0.1]) by localhost (ir-mtaout02.email.it [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id RHvUWAiN1GIS; Fri, 17 Dec 2021 14:31:14 +0100 (CET) Received: from ir-zstore42.email.it (unknown [192.168.25.42]) by pout.email.it (Postfix) with ESMTP id D40E5A54BE; Fri, 17 Dec 2021 14:31:13 +0100 (CET) Date: Fri, 17 Dec 2021 14:31:13 +0100 (CET) From: blinkin@email.it To: Thomas Gleixner Cc: linux-kernel , "Rafael J. Wysocki" , Len Brown , linux-acpi Message-ID: <1554340286.2521703.1639747873475.JavaMail.zimbra@email.it> Subject: Re: Bug report for kernel v4.15-rc8+ MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT X-Originating-IP: [93.146.250.201] X-Mailer: Zimbra 8.8.15_GA_4173 (ZimbraWebClient - GC96 (Linux)/8.8.15_GA_4173) Thread-Index: 0h6WKYAZX0mbI/bojPTMX5RwDzyHlw== Thread-Topic: Bug report for kernel v4.15-rc8+ Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org hello, any news on this? ----- Messaggio originale ----- Da: "Thomas Gleixner" A: blinkin@email.it Cc: "linux-kernel" , "Rafael J. Wysocki" , "Len Brown" , 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