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Lenovo Discovers Situation Of Linux Dropping PCIe Gen 5 NVMe SSDs To Gen 1 Speeds
A change made to the Linux kernel in June 2023 has led to a situation where PCIe Gen5 NVMe solid state drives could potentially drop down to Gen1 speeds..
A change made to the Linux kernel in June 2023 has led to a situation where PCIe Gen5 NVMe solid state drives could potentially drop down to Gen1 speeds... Lenovo engineers spotted this issue and bisected the problem along with coming up with a solution. Lenovo engineers discovered PCIe Gen5 NVMe drives dropping from 32 GT/s down to 2.5 GT/s with Linux kernels from the past year and a half. Besides, the commit de9a6c8d5dbf ("PCI/bwctrl: Add pcie_set_target_speed() introduces two potential issues might cause that the removing 2.5GT/s downstream link speed restriction works fail."
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