Bug 214307

Summary:	Realtek ethernet NIC has suboptimal TX/RX speed when ASPM L1 is enabled
Product:	Drivers	Reporter:	Kai-Heng Feng (kai.heng.feng)
Component:	Network	Assignee:	drivers_network (drivers_network)
Status:	NEW ---
Severity:	normal
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	mainline, linux-next	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	lspci-vv from affected system (Intel Jasper Lake) lspci-vv from working system (AMD Renoir)

Description Kai-Heng Feng 2021-09-03 15:48:31 UTC

On an Intel Jasper Lake system, if ASPM L1 is enabled for Realteak r8169 device, the TX/RX speed becomes abysmal. Use the "dynamic ASPM" mechanism from vendor driver [1] can workaround the issue. The mechanism switches ASPM on and off based on the network traffic, so it probably mitigates the rather long ASPM L1 exit latency.

[1] https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software

Comment 1 Kai-Heng Feng 2021-09-03 15:49:24 UTC

Created attachment 298663 [details]
lspci-vv from affected system (Intel Jasper Lake)

Comment 2 Kai-Heng Feng 2021-09-03 15:49:49 UTC

Created attachment 298665 [details]
lspci-vv from working system (AMD Renoir)