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

[Michal Hocko <mhocko@suse.cz>]

On Fri 05-04-13 12:13:11, Ivan Danov wrote:
> 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.

OK, could you collect /proc/vmstat and /proc/meminfo during that load?

> 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
> 

-- 
Michal Hocko
SUSE Labs

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