Dmesg ring buffer overload problem

Question

I am writing a device driver. I need to seek in system logs; for that I use dmesg. In my case dmesg is overloaded with these warnings:

[ 5578.052140] pcieport 0000:00:1c.5: AER: Corrected error received: 0000:00:1c.5
[ 5578.052146] pcieport 0000:00:1c.5: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
[ 5578.057805] pcieport 0000:00:1c.5: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
[ 5578.057871] pcieport 0000:00:1c.5: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
[ 5578.057872] pcieport 0000:00:1c.5: AER:   device [8086:9d15] error status/mask=00000001/00002000
[ 5578.057873] pcieport 0000:00:1c.5: AER:    [ 0] RxErr                 

Because of dmesg overload, my intended messages are not available. I want the way to read my kernel log or block these pcieport logs. So what can I do to read my intended messages?

Answer 1

Those messages are generated by PCIE Advanced Error Reporting: kernel configuration item CONFIG_PCIEAER.

If you are using a custom kernel, disable that in your kernel configuration. Otherwise, add the noaer boot option to your kernel command line to disable AER without recompiling the kernel, and reboot.

With a bit of Googling, I found a discussion mentioning that using the pcie_aspm=off kernel boot option may also help. But try noaer first, as it's more specific and pcie_aspm=off might be overkill if noaer is sufficient.