#22666: zram doesn't work with lz4 on big endian machines
-------------------------+--------------------------------
Reporter: jhalfmoon@… | Owner: developers
Type: defect | Status: new
Priority: normal | Milestone:
Component: kernel | Version: Chaos Calmer 15.05
Keywords: zram lz4 |
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To reproduce it:
opkg install kmod_zram swap-utils
swapoff /dev/zram0
rmmod zram
modprobe zram
echo lz4 > /sys/devices/virtual/block/zram0/comp_algorithm
echo $((2*1024*1024)) > /sys/block/zram0/disksize
mkswap /dev/zram0
swapon -p 10 /dev/zram0
swapon -s
cat /sys/block/zram0/comp_algorithm
dmesg | tail
The following will be logged:
[821241.390000] zram: Created 1 device(s) ...
[821242.430000] zram0: detected capacity change from 0 to 4194304
[821244.480000] zram: Decompression failed! err=-1, page=0
[821244.480000] Buffer I/O error on dev zram0, logical block 0, async page
read
Apparently this is a known issue and even reported by none other than Greg
Kroah-Hartman: https://lkml.org/lkml/2016/4/5/564
#=== System info:
root@router:~# cat /proc/version
Linux version 3.18.23 (buildbot@builder1) (gcc version 4.8.3
(OpenWrt/Linaro GCC 4.8-2014.04 r47269) ) #1 Sun Jan 31 18:39:35 CET 2016
root@router:~# cat /proc/cpuinfo
system type : Atheros AR9132 rev 2
machine : TP-LINK TL-WR1043ND
processor : 0
cpu model : MIPS 24Kc V7.4
BogoMIPS : 265.42
wait instruction : yes
microsecond timers : yes
tlb_entries : 16
extra interrupt vector : yes
hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc,
0x0ffc, 0x0ffb, 0x0ffb]
isa : mips1 mips2 mips32r1 mips32r2
ASEs implemented : mips16
shadow register sets : 1
kscratch registers : 0
package : 0
core : 0
VCED exceptions : not available
VCEI exceptions : not available
--
Ticket URL: <https://dev.openwrt.org/ticket/22666>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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