Google Proposes Shutdown Changes To Speed Linux Reboots

UnknowingFool writes: Google has proposed a change on how Linux kernel handles shutdowns specifically when NVMe drives are used. The issue that Google is finding is that the current NVMe drivers use synchronous APIs when shutting down and it can take 4.5 seconds for each NVMe drive. For a system with 16 NVMe drives that could take more than a minute longer. While this is a problem that only large enterprise systems face currently, more enterprises are replacing their mechanical disk RAID servers with SSD ones. [...] The proposed patches from Google allow for an optional asynchronous shutdown interface at the bus level. The new interface maintains backwards compatibility with the synchronous implementation. As part of the patches, all PCI Express based devices are moved to use the async interface, implements the changes at the PCIe level, and then the changes to the NVMe driver to exploit the async shutdown interface.

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