Messages in this thread | | | Subject | Re: `pci_apply_final_quirks()` taking half a second | From | Paul Menzel <> | Date | Tue, 26 Dec 2017 16:55:20 +0100 |
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Dear Bjorn,
Am 08.04.2017 um 17:41 schrieb Bjorn Helgaas: > On Fri, Apr 07, 2017 at 11:07:15PM +0200, Paul Menzel wrote:
>> Measuring where time is spent during boot with `systemd-bootchart` >> on an Asus A780FullHD, it turns out that half a second is spent in >> `pci_apply_final_quirks()`. > > I agree, that seems like a crazy amount of time. > > Can you figure out how to turn on pr_debug() (via the dynamic debug > mess or whatever) and boot with "initcall_debug"? That should tell us > how long each quirk took.
I am sorry for taking so long to reply. I finally added `dyndbg=file quirks.c +p` to the command line of Linux 4.13.13. This is on another AMD system (Asus F285M Pro).
``` […] Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_mmio_always_on+0x0/0x10 returned after 0 usecs for 0000:00:00.0 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_no_pm_reset+0x0/0x20 returned after 0 usecs for 0000:00:01.0 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_mmio_always_on+0x0/0x10 returned after 0 usecs for 0000:00:18.0 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_mmio_always_on+0x0/0x10 returned after 0 usecs for 0000:00:18.1 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_mmio_always_on+0x0/0x10 returned after 0 usecs for 0000:00:18.2 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_mmio_always_on+0x0/0x10 returned after 0 usecs for 0000:00:18.3 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_mmio_always_on+0x0/0x10 returned after 0 usecs for 0000:00:18.4 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_mmio_always_on+0x0/0x10 returned after 0 usecs for 0000:00:18.5 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup pci_fixup_video+0x0/0x110 returned after 4 usecs for 0000:00:01.0 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_usb_early_handoff+0x0/0x6b0 returned after 197 usecs for 0000:00:10.0 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_usb_early_handoff+0x0/0x6b0 returned after 127 usecs for 0000:00:10.1 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_usb_early_handoff+0x0/0x6b0 returned after 88643 usecs for 0000:00:12.0 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_usb_early_handoff+0x0/0x6b0 returned after 137 usecs for 0000:00:12.2 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup pci_fixup_amd_ehci_pme+0x0/0x30 returned after 1 usecs for 0000:00:12.2 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_usb_early_handoff+0x0/0x6b0 returned after 85770 usecs for 0000:00:13.0 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_usb_early_handoff+0x0/0x6b0 returned after 134 usecs for 0000:00:13.2 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup pci_fixup_amd_ehci_pme+0x0/0x30 returned after 1 usecs for 0000:00:13.2 Dez 26 16:21:46 asus-f2a85-pro kernel: pci fixup quirk_usb_early_handoff+0x0/0x6b0 returned after 125 usecs for 0000:03:00.0[…] ```
So it’s `pci fixup quirk_usb_early_handoff` taking around 85 ms, and that twice.
>> Here are the times copied from the SVG: >> >> init_ladder 0.012s >> init_menu 0.012s >> pm_sysrq_init 0.012s >> acpi_init 0.027s >> pci_subsys_init 0.008s >> hpet_late_init 0.004s >> tracer_init_tracefs 0.002s >> event_trace_init 0.008s >> pnpacpi_init 0.002s >> chr_dev_init 0.003s >> init_acpi_pm_clocksource 0.004s >> pci_apply_final_quirks 0.452s >> populate_rootfs 0.400s >> pci_iommu_init 0.003s >> rsa_init 0.058s >> serial8250_init 0.020s >> i8042_init 0.003s >> load_system_certificate_list 0.002s >> ata_init 0.007s >> ehci_pci_init 0.030s >> ohci_pci_init 0.312s >> ahci_pci_driver_init 0.342s >> atiixp_pci_driver_init 0.337s >> hid_init 0.004s >> init_sr 0.031s
[…] >> It’d be great, if the times could be reduced, so that the time from >> GRUB to entering the LUKS passphrase gets smaller.
Kind regards,
Paul
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