Re: [PATCH 1/3] nvme: Add adaptive PCIe link rate switching function

[Keith Busch]

On Tue, Nov 03, 2026 at 02:25:43PM +0800, Liao Xuan wrote:
> Add support for dynamically adjusting the PCIe link rate of NVMe
> devices based on I/O activity. The link is downgraded to a
> configurable minimum rate during periods of low activity to save
> power, and upgraded to the maximum supported rate as soon as the
> workload exceeds a computed threshold, so that peak performance is
> maintained under load.

Pretty sure PCIe ASPM L1 states would save more power than downgrading
the link rate, as well as have better entry/exit latency than a software
driven monitor and link retrain.