Public bug reported:
I have an dual processor "Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz".
Its an octo core with hyper-thread so the number of virtual processors are 32:
# grep -c ^processor /proc/cpuinfo
32
zram fails to install and start. from dmesg:
[20817.608907] zram: Creating 32 devices ...
[20817.621309] Adding 514360k swap on /dev/zram0. Priority:5 extents:1
across:514360k SS
[20817.624251] Adding 514360k swap on /dev/zram1. Priority:5 extents:1
across:514360k SS
[20817.627307] Adding 514360k swap on /dev/zram2. Priority:5 extents:1
across:514360k SS
[20817.630403] Adding 514360k swap on /dev/zram3. Priority:5 extents:1
across:514360k SS
[20817.633359] Adding 514360k swap on /dev/zram4. Priority:5 extents:1
across:514360k SS
[20817.636437] Adding 514360k swap on /dev/zram5. Priority:5 extents:1
across:514360k SS
[20817.639563] Adding 514360k swap on /dev/zram6. Priority:5 extents:1
across:514360k SS
[20817.642648] Adding 514360k swap on /dev/zram7. Priority:5 extents:1
across:514360k SS
[20817.645693] Adding 514360k swap on /dev/zram8. Priority:5 extents:1
across:514360k SS
[20817.648791] Adding 514360k swap on /dev/zram9. Priority:5 extents:1
across:514360k SS
[20817.651829] Adding 514360k swap on /dev/zram10. Priority:5 extents:1
across:514360k SS
[20817.654847] Adding 514360k swap on /dev/zram11. Priority:5 extents:1
across:514360k SS
[20817.657859] Adding 514360k swap on /dev/zram12. Priority:5 extents:1
across:514360k SS
[20817.660907] Adding 514360k swap on /dev/zram13. Priority:5 extents:1
across:514360k SS
[20817.663990] Adding 514360k swap on /dev/zram14. Priority:5 extents:1
across:514360k SS
[20817.666961] Adding 514360k swap on /dev/zram15. Priority:5 extents:1
across:514360k SS
[20817.669740] Adding 514360k swap on /dev/zram16. Priority:5 extents:1
across:514360k SS
[20817.672784] Adding 514360k swap on /dev/zram17. Priority:5 extents:1
across:514360k SS
[20817.675825] Adding 514360k swap on /dev/zram18. Priority:5 extents:1
across:514360k SS
[20817.678807] Adding 514360k swap on /dev/zram19. Priority:5 extents:1
across:514360k SS
[20817.681866] Adding 514360k swap on /dev/zram20. Priority:5 extents:1
across:514360k SS
[20817.684797] Adding 514360k swap on /dev/zram21. Priority:5 extents:1
across:514360k SS
[20817.687597] Adding 514360k swap on /dev/zram22. Priority:5 extents:1
across:514360k SS
[20817.690546] Adding 514360k swap on /dev/zram23. Priority:5 extents:1
across:514360k SS
[20817.693530] Adding 514360k swap on /dev/zram24. Priority:5 extents:1
across:514360k SS
[20817.696615] Adding 514360k swap on /dev/zram25. Priority:5 extents:1
across:514360k SS
[20817.699563] Adding 514360k swap on /dev/zram26. Priority:5 extents:1
across:514360k SS
[20817.702580] Adding 514360k swap on /dev/zram27. Priority:5 extents:1
across:514360k SS
[20817.705844] init: zram-config pre-start process (7513) terminated with
status 255
>From my tests I see that the maximum number of swaps linux accepts to
create is 29. I already had 1 swap partition so zram-config fails to
start trying to create the 28th extent.
I made a patch to zram-config.conf that, before starting zram-config,
counts how many swap spaces are already configured and reduce them from
the number of extents to create:
patch:
# diff -u zram-config.conf.dpkg-dist zram-config.conf
--- zram-config.conf.dpkg-dist 2012-01-09 11:29:00.000000000 -0200
+++ zram-config.conf 2012-11-13 02:10:30.122396348 -0200
@@ -6,6 +6,8 @@
pre-start script
# load dependency modules
NRDEVICES=$(grep -c ^processor /proc/cpuinfo | sed 's/^0$/1/')
+ NRSWAPS=$(($(cat /proc/swaps | wc -l)+$NRDEVICES))
+ if [ $NRSWAPS>=30 ]; then NRDEVICES=$((30+$NRDEVICES-$NRSWAPS)); fi
if modinfo zram | grep -q ' zram_num_devices:' 2>/dev/null; then
MODPROBE_ARGS="zram_num_devices=${NRDEVICES}"
elif modinfo zram | grep -q ' num_devices:' 2>/dev/null; then
I have tested on a 32 core and 4 core machines with 1 swap partition and
no error at start.
** Affects: zram-config (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "zram-config.conf.patch"
https://bugs.launchpad.net/bugs/1078165/+attachment/3431818/+files/zram-config.conf.patch
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https://bugs.launchpad.net/bugs/1078165
Title:
zram-config fails to start/install on a system with more then 30
processors
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