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Home > The Backend Engineering Show with Hussein Nasser > Google thinks Linux is slow to reboot, so they patch it
Podcast: The Backend Engineering Show with Hussein Nasser
Episode:

Google thinks Linux is slow to reboot, so they patch it
Category: Technology
Duration: 00:09:02
Publish Date: 2022-03-30 00:27:25
Description:

Google linux boxes have over 16 NVMe SSD PCIe Express drives.When a shutdown signal is sent to linux, the OS iterate through each NVMe and send synchronous request to shutdown that takes 4.5 seconds. This adds up to over a minute to achieve a reboot. Google patches linux with asynchronous Shutdown APIs   


Resources https://www.phoronix.com/forums/forum/phoronix/latest-phoronix-articles/1316262-google-has-a-problem-with-linux-server-reboots-too-slow-due-to-too-many-nvme-drives 


patch https://lore.kernel.org/lkml/20220328230008.3587975-1-tansuresh@google.com/ 


Sync vs async  https://www.youtube.com/results?search_query=asynchronous+vs+synchronous+hussein

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