public
/
nixpkgs
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
nixos/doc/manual/release-notes/rl-1903.xml
View File

@ -577,7 +577,7 @@
but is still possible by setting <literal>zramSwap.swapDevices</literal> explicitly. but is still possible by setting <literal>zramSwap.swapDevices</literal> explicitly.
</para> </para>
<para> <para>
Default algorithm for ZRAM swap was changed to <literal>zstd</literal>. ZRAM algorithm can be changed now.
</para> </para>
<para> <para>
Changes to ZRAM algorithm are applied during <literal>nixos-rebuild switch</literal>, 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 { algorithm = mkOption {
default = "zstd"; default = "lzo";
example = "lzo"; example = "lz4";
type = with types; either (enum [ "lzo" "lz4" "zstd" ]) str; type = with types; either (enum [ "lzo" "lz4" "zstd" ]) str;
description = '' description = ''
Compression algorithm. <literal>lzo</literal> has good compression, Compression algorithm. <literal>lzo</literal> has good compression,
but is slow. <literal>lz4</literal> has bad compression, but is fast. 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 You can check what other algorithms are supported by your zram device with
<programlisting>cat /sys/class/block/zram*/comp_algorithm</programlisting> <programlisting>cat /sys/class/block/zram*/comp_algorithm</programlisting>
''; '';