On Sat, 2017-04-08 at 10:41 -0500, Bjorn Helgaas 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. It could well be spending a fair amount of time just attempting to match each device against the list. When I first implemented the table- based quirks, back in the mists of time, there were relatively few. Now I wonder if it's worth sorting the list by vendor ID or something, at least for the common case of the quirks which match on vendor/device. I note it's also reading PCI_CACHE_LINE_SIZE From config space for each device in pci_apply_final_quirks(). How long does that take?
Attachment:
smime.p7s
Description: S/MIME cryptographic signature
