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zram-swap: default to lzo instead of lzo-rle compression

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On devices with small amounts of RAM, zram-swap fails to initialise due to the
default compression algorithm (lzo-rle). Startup example on an AirGrid M2, with
32 MiB of RAM:

root@airgrid:/etc/config# /etc/init.d/zram start
zram_start: activating '/dev/zram0' for swapping (13 MegaBytes)
zram_reset: enforcing defaults via /sys/block/zram0/reset
sh: write error: Out of memory
mkswap: image is too small
swapon: /dev/zram0: Invalid argument
root@airgrid:/etc/config#

Fix this by defaulting to traditional lzo, which works fine and is always
available.

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
This commit is contained in:
Rui Salvaterra 2020-07-30 13:49:18 +01:00 committed by Jo-Philipp Wich
parent 0fbdb51f76
commit 419f149e48
1 changed files with 3 additions and 2 deletions
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5
package/system/zram-swap/files/zram.init
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@ -85,8 +85,9 @@ zram_comp_algo()
local dev="$1" local dev="$1"
local zram_comp_algo="$( uci -q get system.@system[0].zram_comp_algo )" local zram_comp_algo="$( uci -q get system.@system[0].zram_comp_algo )"
if [ -z "$zram_comp_algo" ] || [ ! -e /sys/block/$( basename $dev )/comp_algorithm ]; then if [ -z "$zram_comp_algo" ]; then
return 0 # lzo-rle fails on small RAM devices, default to lzo, which is always available
zram_comp_algo="lzo"
fi fi
if [ $(grep -c "$zram_comp_algo" /sys/block/$( basename $dev )/comp_algorithm) -ne 0 ]; then if [ $(grep -c "$zram_comp_algo" /sys/block/$( basename $dev )/comp_algorithm) -ne 0 ]; then