Re: System freezes when RAM is full (64-bit)

[Ivan Danov <huhavel@gmail.com>]

Tried with vm.swappiness=60, but the only improvement is that now the 
mouse input is less choppy than before, but still the problem remains - 
the computer is not usable at all, one could not even stop the program, 
causing the problem.

Best,
Ivan
--
On 04/04/13 17:16, Michal Hocko wrote:
> On Thu 04-04-13 16:10:06, Ivan Danov wrote:
>> Hi Michal,
>>
>> Yes, I use swap partition (2GB), but I have applied some things for
>> keeping the life of the SSD hard drive longer. All the things I have
>> done are under point 3. at
>> http://www.rileybrandt.com/2012/11/18/linux-ultrabook/.
> OK, I guess I know what's going on here.
> So you did set vm.swappiness=0 which (for some time) means that there is
> almost no swapping going on (although you have plenty of swap as you are
> mentioning above).
> This shouldn't be a big deal normally but you are also backing your
> /tmp on tmpfs which is in-memory filesystem. This means that if you
> are writing to /tmp a lot then this content will fill up your memory
> which is not swapped out until the memory reclaim is getting into real
> troubles - most of the page cache is dropped by that time so your system
> starts trashing.
>
> I would encourage you to set swappiness to a more reasonable value (I
> would use the default value which is 60). I understand that you are
> concerned about your SSD lifetime but your user experience sounds like a
> bigger priority ;)
>
>> By system freezes, I mean that the desktop environment doesn't react
>> on my input. Just sometimes the mouse is reacting very very choppy
>> and slowly, but most of the times it is not reacting at all. In the
>> attached file, I have the output of the script and the content of
>> dmesg for all levels from warn to emerg, as well as my kernel config.
> I haven't checked your attached data but you should get an overview from
> Shmem line from /proc/meminfo which tells you how much shmem/tmpfs
> memory you are using and grep "^Swap" /proc/meminfo will tell you more
> about your swap usage.
>
>> Best,
>> Ivan
> HTH

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