On 2019-07-24 7:38 a.m., Bjorn Helgaas wrote: > On Wed, Jul 24, 2019 at 12:54:00PM +0000, Nicholas Johnson wrote: >> Hi all, >> >> I was just rebasing my patches for linux 5.3-rc1 and noticed a possible >> regression that shows on both of my machines. It is also reproducible >> with the unmodified Ubuntu mainline kernel, downloadable at [1]. >> >> Running the lspci command takes 1-3 seconds with 5.3-rc1 (rather than an >> imperceivable amount of time). Booting with pci.dyndbg does not reveal >> why. >> >> $ uname -r >> 5.3.0-050300rc1-generic >> $ time lspci -vt 1>/dev/null >> >> real 0m2.321s >> user 0m0.026s >> sys 0m0.000s >> >> If none of you are aware of this or what is causing it, I will submit a >> bug report to Bugzilla. > > I wasn't aware of this; thanks for reporting it! I wasn't able to > reproduce this in qemu. Can you play with "strace -r lspci -vt" and > the like? Maybe try "lspci -n" to see if it's related to looking up > the names? I also just tested 5.3-rc1 on my machine and lspci behaves normally. Logan
