On Thu, 28 Dec 2017, Bjorn Helgaas wrote: > On Tue, Dec 26, 2017 at 04:55:20PM +0100, Paul Menzel wrote: > > 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_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. > > Wow. That's pretty painful, but of course I don't know how to fix it. > From looking at quirk_usb_early_handoff(), it may depend on BIOS > details. Maybe the USB folks will have some ideas. Can we see the output from lspci? It would help to know what the 12.0 and 13.0 devices are. Alan Stern
