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nixos-ami: update nvme_core.io_timeout for linux kernel >= 4.15 

NixOS 20.03 is built on kernel 5.4 and 19.09 is on 4.19, so we should update
this option to the highest value possible, per linked upstream instructions from
Amazon.
This commit is contained in:
Benjamin Hipple 2020-03-15 19:18:51 -04:00
parent 81d84153c7
commit 129176452c
1 changed files with 8 additions and 3 deletions
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11
nixos/maintainers/scripts/ec2/amazon-image.nix
View File

@ -8,10 +8,15 @@ in {
imports = [ ../../../modules/virtualisation/amazon-image.nix ];
# Required to provide good EBS experience,
# Amazon recomments setting this to the highest possible value for a good EBS
# experience, which prior to 4.15 was 255.
# https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/nvme-ebs-volumes.html#timeout-nvme-ebs-volumes
# TODO change value to 4294967295 when kernel is updated to 4.15 or later
config.boot.kernelParams = [ "nvme_core.io_timeout=255" ];
config.boot.kernelParams =
let timeout =
if pkgs.lib.versionAtLeast config.boot.kernelPackages.kernel.version "4.15"
then "4294967295"
else "255";
in [ "nvme_core.io_timeout=${timeout}" ];
options.amazonImage = {
name = mkOption {