<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Xorg take 100% CPU when using multiple independent screen configuration" href="https://bugs.freedesktop.org/show_bug.cgi?id=90482#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Xorg take 100% CPU when using multiple independent screen configuration" href="https://bugs.freedesktop.org/show_bug.cgi?id=90482">bug 90482</a> from <a class="email" href="mailto:matti.nykyri@iki.fi" title="Matti Nykyri <matti.nykyri@iki.fi>"> Matti Nykyri</a> <pre>I also have two screen setup and am facing the same problem since beginning of April. Strace shows the KOBJENT NETLINK socket in Xorg returning immediately from select. The host gets around 9000 interupts / sec: cat /proc/interupts CPU0 CPU1 CPU2 CPU3 0: 151 0 0 0 IO-APIC-edge timer 1: 1 0 0 0 IO-APIC-edge i8042 8: 20 0 0 0 IO-APIC-edge rtc0 9: 0 0 0 0 IO-APIC-fasteoi acpi 12: 1 0 0 0 IO-APIC-edge i8042 16: 8898 0 0 0 IO-APIC 16-fasteoi ehci_hcd:usb1 17: 1268 0 0 0 IO-APIC 17-fasteoi snd_hda_intel 18: 0 0 0 0 IO-APIC 18-fasteoi 0000:03:00.0, i801_smbus 19: 70297 0 0 0 IO-APIC 19-fasteoi pata_jmicron 23: 33 0 0 0 IO-APIC 23-fasteoi ehci_hcd:usb2 24: 6912419 0 0 0 HPET_MSI-edge hpet2 25: 0 7491688 0 0 HPET_MSI-edge hpet3 26: 0 0 4552335 0 HPET_MSI-edge hpet4 27: 0 0 0 8398350 HPET_MSI-edge hpet5 34: 155556 0 0 0 PCI-MSI-edge nouveau 35: 37000 0 0 0 PCI-MSI-edge 0000:00:1f.2 36: 0 0 0 0 PCI-MSI-edge 0000:09:00.0 37: 120172 0 0 0 PCI-MSI-edge enp5s0 38: 325 0 0 0 PCI-MSI-edge snd_hda_intel NMI: 76929 95741 80757 78650 Non-maskable interrupts LOC: 0 125 121 118 Local timer interrupts SPU: 0 0 0 0 Spurious interrupts PMI: 76928 95740 80756 78649 Performance monitoring interrupts IWI: 11 10 11 5 IRQ work interrupts RTR: 5 0 0 0 APIC ICR read retries RES: 83545 76436 81720 73802 Rescheduling interrupts CAL: 142 146 161 94 Function call interrupts TLB: 276 150 213 227 TLB shootdowns TRM: 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 Machine check exceptions MCP: 251 251 251 251 Machine check polls ERR: 0 MIS: 0 Kernel function tracer: cat /sys/kernel/debug/tracing/trace X-2956 [000] .... 74409.277687: __fget_light <-__fdget zsh-6138 [002] d... 74409.277688: __mod_zone_page_state <-get_page_from_freelist X-2956 [000] .... 74409.277688: sock_poll <-do_select zsh-6138 [002] d... 74409.277688: zone_statistics <-get_page_from_freelist X-2956 [000] .... 74409.277688: unix_poll <-sock_poll zsh-6138 [002] d... 74409.277688: __inc_zone_state <-zone_statistics X-2956 [000] .... 74409.277688: __fdget <-do_select zsh-6138 [002] d... 74409.277688: __inc_zone_state <-zone_statistics X-2956 [000] .... 74409.277688: __fget_light <-__fdget X-2956 [000] .... 74409.277688: sock_poll <-do_select X-2956 [000] .... 74409.277688: unix_poll <-sock_poll X-2956 [000] .... 74409.277688: __fdget <-do_select X-2956 [000] .... 74409.277688: __fget_light <-__fdget X-2956 [000] .... 74409.277688: sock_poll <-do_select X-2956 [000] .... 74409.277688: unix_poll <-sock_poll X-2956 [000] .... 74409.277688: __fdget <-do_select X-2956 [000] .... 74409.277688: __fget_light <-__fdget X-2956 [000] .... 74409.277689: sock_poll <-do_select X-2956 [000] .... 74409.277689: unix_poll <-sock_poll X-2956 [000] .... 74409.277689: __fdget <-do_select X-2956 [000] .... 74409.277689: __fget_light <-__fdget X-2956 [000] .... 74409.277689: sock_poll <-do_select X-2956 [000] .... 74409.277689: unix_poll <-sock_poll X-2956 [000] .... 74409.277689: __fdget <-do_select X-2956 [000] .... 74409.277689: __fget_light <-__fdget X-2956 [000] .... 74409.277689: sock_poll <-do_select X-2956 [000] .... 74409.277689: unix_poll <-sock_poll zsh-6138 [002] .... 74409.277689: kmemleak_alloc <-kmalloc_order X-2956 [000] .... 74409.277689: __fdget <-do_select X-2956 [000] .... 74409.277690: __fget_light <-__fdget X-2956 [000] .... 74409.277690: sock_poll <-do_select Perf top: PerfTop: 9602 irqs/sec kernel:86.0% exact: 0.0% [4000Hz cycles], (all, 4 CPUs) ------------------------------------------------------------------------------------------------------------------------------------------------------------ 19.24% [kernel] [k] do_select 17.08% [kernel] [k] __fget_light 13.34% [kernel] [k] unix_poll 13.18% [kernel] [k] sock_poll 3.00% [kernel] [k] do_raw_spin_lock 1.81% [kernel] [k] _raw_spin_unlock_irqrestore 1.55% Xorg [.] WaitForSomething 1.45% [kernel] [k] __fdget 1.38% [kernel] [k] datagram_poll 1.37% [kernel] [k] fput 1.37% [kernel] [k] _raw_spin_lock_irqsave 1.37% [kernel] [k] __pollwait 1.31% [vdso] [.] __vdso_clock_gettime 1.23% [kernel] [k] memset 0.76% libdrm_nouveau.so.2.0.0 [.] pushbuf_flush 0.76% libdrm_nouveau.so.2.0.0 [.] pushbuf_kref 0.72% nouveau_drv.so [.] drmmode_wakeup_handler 0.72% [kernel] [k] copy_user_generic_string 0.64% [kernel] [k] do_raw_spin_unlock 0.61% [kernel] [k] hpet_msi_next_event 0.57% libdrm_nouveau.so.2.0.0 [.] nouveau_bo_ref 0.55% [kernel] [k] system_call 0.54% [kernel] [k] core_sys_select 0.51% [kernel] [k] select_estimate_accuracy 0.45% nouveau_drv.so [.] NVBlockHandler 0.44% Xorg [.] GetTimeInMillis 0.43% [kernel] [k] poll_freewait 0.43% [kernel] [k] ktime_get_ts64 0.42% [kernel] [k] remove_wait_queue 0.41% Xorg [.] IdleTimeWakeupHandler 0.40% [kernel] [k] add_wait_queue 0.39% libexa.so [.] ExaBlockHandler 0.37% Xorg [.] BlockHandler 0.35% Xorg [.] WakeupHandler 0.32% Xorg [.] xf86Wakeup 0.31% [kernel] [k] nouveau_barobj_wr32 The bug activates when display of a screen is turned on. Restarting X fixes the issue until a display is cycled.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>