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Date: Wed, 11 Aug 2021 15:51:10 +0200 (CEST) From: blinkin@...il.it To: Thomas Gleixner <tglx@...utronix.de> Cc: linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: Bug report for kernel v4.15-rc8+ 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) 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 > 3) Please provide the output of /proc/interrupts for both boot scenarios attached: interrupts_clean.txt, interrupts_after1min_clean.txt (reproducing bug) interrupts_irqaffinity0.txt and interrupts_after1min_irqaffinity0.txt (with workaround) P.S.: I don't know if it can help, but the behavior is worse in later kernel versions. I can't pinpoint a precise version because it looks like a gradual effect, but I can tell v4.19 and later versions are performing worse than 4.15-rc9. Actually in 4.15-rc9 the slowness is apparent only when doing resource-intensive tasks like playing 3d games, while for example in 4.19 I experience missed clicks and keyboard typing delay with just a text editor) Thanks for the support ----- Messaggio originale ----- Da: "Thomas Gleixner" <tglx@...utronix.de> A: blinkin@...il.it Cc: "linux-kernel" <linux-kernel@...r.kernel.org> Inviato: Martedì, 10 agosto 2021 19:09:32 Oggetto: Re: Bug report for kernel v4.15-rc8+ On Tue, Aug 10 2021 at 16:05, blinkin@...il.it wrote: > The general symptom is a slow and unresponsive system (e.g. on gnome > there's a delay before displaying typed characters, up to 3-5 > seconds. Animations are jittering, mouse clicks sometimes are missed). > 3D games are now impossible to play due to poor performance. > > System feels as if the CPU is always busy (htop shows one core at ~ > 90% most of the time both with and without the workaround, not sure > it's correlated) That's definitely wrong. What is consuming CPU time? > It's running OpenSuse Leap 15.2 (the bug came out when upgrading from > 15.1, thus going from kernel 4.12 to 5.3) I suspect the same bug is > responsible for making me switch to suse after failing to upgrade > debian from 9 (kernel 4.9) to 10 (kernel 4.19) > > The workaround is to pass irqaffinity=0 on boot. > > Attached: dmesg output with and without the irqaffinity parameter, > lspci output, /proc/cpuinfo contents. > > Let me know what else is needed. 1) You're booting with an out of tree module: > [ 17.080069] vboxdrv: loading out-of-tree module taints kernel. Please reproduce without this. 2) Please provide information what is consuming 90% of a CPU 3) Please provide the output of /proc/interrupts for both boot scenarios Take a snapshot right after boot and another one a minute later. Thanks, tglx View attachment "dmesg_novboxdrv_clean.txt" of type "text/plain" (66803 bytes) View attachment "dmesg_novboxdrv_irqaffinity0.txt" of type "text/plain" (100704 bytes) View attachment "interrupts_after1min_clean.txt" of type "text/plain" (3147 bytes) View attachment "interrupts_after1min_irqaffinity0.txt" of type "text/plain" (3147 bytes) View attachment "interrupts_clean.txt" of type "text/plain" (3153 bytes) View attachment "interrupts_irqaffinity0.txt" of type "text/plain" (3153 bytes)
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