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nixos/qemu-vm: add virtualisation.msize option

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This commit is contained in:
jakobrs 2021-01-31 13:40:48 +01:00
parent dd04524e6e
commit 278843e979
1 changed files with 15 additions and 3 deletions
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18
nixos/modules/virtualisation/qemu-vm.nix
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@ -275,6 +275,18 @@ in
''; '';
}; };
virtualisation.msize =
mkOption {
default = null;
type = types.nullOr types.ints.unsigned;
description =
''
msize (maximum packet size) option passed to 9p file systems, in
bytes. Increasing this should increase performance significantly,
at the cost of higher RAM usage.
'';
};
virtualisation.diskSize = virtualisation.diskSize =
mkOption { mkOption {
default = 512; default = 512;
@ -663,7 +675,7 @@ in
${if cfg.writableStore then "/nix/.ro-store" else "/nix/store"} = ${if cfg.writableStore then "/nix/.ro-store" else "/nix/store"} =
{ device = "store"; { device = "store";
fsType = "9p"; fsType = "9p";
options = [ "trans=virtio" "version=9p2000.L" "cache=loose" ]; options = [ "trans=virtio" "version=9p2000.L" "cache=loose" ] ++ lib.optional (cfg.msize != null) "msize=${toString cfg.msize}";
neededForBoot = true; neededForBoot = true;
}; };
"/tmp" = mkIf config.boot.tmpOnTmpfs "/tmp" = mkIf config.boot.tmpOnTmpfs
@ -676,13 +688,13 @@ in
"/tmp/xchg" = "/tmp/xchg" =
{ device = "xchg"; { device = "xchg";
fsType = "9p"; fsType = "9p";
options = [ "trans=virtio" "version=9p2000.L" ]; options = [ "trans=virtio" "version=9p2000.L" ] ++ lib.optional (cfg.msize != null) "msize=${toString cfg.msize}";
neededForBoot = true; neededForBoot = true;
}; };
"/tmp/shared" = "/tmp/shared" =
{ device = "shared"; { device = "shared";
fsType = "9p"; fsType = "9p";
options = [ "trans=virtio" "version=9p2000.L" ]; options = [ "trans=virtio" "version=9p2000.L" ] ++ lib.optional (cfg.msize != null) "msize=${toString cfg.msize}";
neededForBoot = true; neededForBoot = true;
}; };
} // optionalAttrs (cfg.writableStore && cfg.writableStoreUseTmpfs) } // optionalAttrs (cfg.writableStore && cfg.writableStoreUseTmpfs)