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zram: revert "change default algorithm to zstd" (#56856)

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19.03 default kernel is still 4.14, which doesn't support zstd. So,
zramSwap in current fasion fails on default kernel.
This commit is contained in:
Danylo Hlynskyi 2019-03-07 02:07:52 +02:00 committed by danbst
parent af5909a272
commit ef1911d045
2 changed files with 4 additions and 4 deletions
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2
nixos/doc/manual/release-notes/rl-1903.xml
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@ -577,7 +577,7 @@
but is still possible by setting <literal>zramSwap.swapDevices</literal> explicitly.
</para>
<para>
Default algorithm for ZRAM swap was changed to <literal>zstd</literal>.
ZRAM algorithm can be changed now.
</para>
<para>
Changes to ZRAM algorithm are applied during <literal>nixos-rebuild switch</literal>,

6
nixos/modules/config/zram.nix
View File

@ -91,13 +91,13 @@ in
};
algorithm = mkOption {
default = "zstd";
example = "lzo";
default = "lzo";
example = "lz4";
type = with types; either (enum [ "lzo" "lz4" "zstd" ]) str;
description = ''
Compression algorithm. <literal>lzo</literal> has good compression,
but is slow. <literal>lz4</literal> has bad compression, but is fast.
<literal>zstd</literal> is both good compression and fast.
<literal>zstd</literal> is both good compression and fast, but requires newer kernel.
You can check what other algorithms are supported by your zram device with
<programlisting>cat /sys/class/block/zram*/comp_algorithm</programlisting>
'';