Re: ASMedia ASM1812 PCIe switch causes system to freeze hard

[Lukas Wunner <lukas@wunner.de>]

On Sat, Feb 25, 2023 at 01:37:23PM -0500, fk1xdcio@duck.com wrote:
> I'm testing a generic 4-port PCIe x4 2.5Gbps Ethernet NIC. It uses an
> ASM1812 for the PCI packet switch to four RTL8125BG network controllers.
> 
> The more load I put on the NIC the faster the system freezes. For example if
> I activate four 2.5Gbps fully saturated network connections then the system
> hard freezes almost immediately. When the system freezes it seems completely
> dead. SysRq doesn't work, serial consoles are dead, etc. so I haven't been
> able to get much debugging information. I have tested on various different
> physical systems, Xeon E5, Xeon E3, i7, and they all behave the same so it
> doesn't seem like a system hardware issue.
> 
> Disabling IOMMU makes it run for a little longer before crashing.
> 
> The tiny bit of error information I have been able to get under various
> conditions (eg. disabling ASPM, forcing D0, etc):
>   Test #1:
>   pcieport 0000:04:02.0: Unable to change power state from D3hot to D0,
> device inaccessible

Have you tried adding pcie_port_pm=off to the kernel command line?

Thanks,

Lukas