AW: zRAM broken on Raring?

Nio Wiklund nio.wiklund at gmail.com
Sun Sep 29 08:11:12 UTC 2013


Hi Leszek,

John has zRAM in Raring. It was pulled in by a package he installed, and
I try to help him switch it off.

Probably it is better to do it in /etc/init.d, but I am not familiar
with that method, so I didn't suggest that method. Please describe it,
I'm reading and learning :-)

Best regards
Nio

On 2013-09-29 10:03, Leszek Lesner wrote:
> Honestlky I don't get the cronjob. Why is it necessary? On reboot the
> init system runs the stop command on zram-config in /etc/init.d which
> dies exactly the same as the cronjob here.
> 
> *Von: *Nio Wiklund
> *Gesendet: *Sonntag, 29. September 2013 08:29
> *An: *John Hupp; lubuntu-users at lists.ubuntu.com
> *Betreff: *Re: zRAM broken on Raring?
> 
> 
> On 2013-09-29 02:23, John Hupp wrote:
>> On 9/28/2013 12:23 PM, sudodus wrote:
>>> Hi John,
>>>
>>> Yes, let us hope the bug will be fixed soon, and it will be
>>> back-ported :-)
>>>
>>> Can you run your application without zRAM? You can switch it off in a
>>> simple way (and have it ready for reactivation) like this with crontab.
>>> Edit the crontab with
>>>
>>> sudo crontab -e
>>>
>>> $ sudo crontab -l |tail -n3
>>> # m h dom mon dow command
>>> @reboot /sbin/swapoff /dev/zram*
>>> @reboot /sbin/rmmod zram
>>>
>>> Best regards
>>> Nio
>>
>> I set up a root crontab as you suggested, Nio, and syslog confirms that
>> the two crontab commands are run after the zram setup commands.
>>
>> But sudo parted -l still reports:
>> Error: /dev/zram1: unrecognised disk label
>>
>> Does anyone know if the zram1 device would be using memory (the setup
>> command designated 512MB for zram on this 1GB setup) or otherwise doing
>> any harm?
> 
> Hi John,
> 
> The zRAM is not removed, only de-activated. Only if zRAM is used already
> '@reboot', when cron runs the command, and there is no place to put the
> content, then swapoff would fail (I think).
> 
> 1. Did you check with
> 
> swapon -s
> 
> This command should return no zram block device.
> 
> 2. Check the memory with
> 
> free -m
> 
> and install and run
> 
> htop
> 
> to check if something related to zram is running or using memory.
> 
> Best regards
> Nio
> 
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