What's happening with 16.04 & 16.10? 100% of RAM being used by nothing!

[Martinx - ジェームズ]

Oops, file is: "/etc/default/grub"...

On 8 October 2016 at 16:00, Martinx - ジェームズ <thiagocmartinsc at gmail.com>
wrote:

> Whee!!! One thing that I love most about Linux is that the problem
> usually, me!   :-D
>
> I was playing with DPDK weeks ago and I completely forgot about the
> following line in my /etc/grub/default:
>
> GRUB_CMDLINE_LINUX_DEFAULT="console=ttyS0,115200n8 quiet splash iommu=pt
> intel_iommu=on default_hugepagesz=1GB hugepagesz=1G hugepages=64"
>
> After removing "default_hugepagesz=1GB hugepagesz=1G hugepages=64",
> problem solved! I got my RAM back...
>
> It is interesting to note that htop doesn't show anything related to this!
>
> Cheers!
>
> On 6 October 2016 at 14:09, Ralf Mardorf <silver.bullet at zoho.com> wrote:
>
>> On Thu, 6 Oct 2016 11:29:44 -0400, Martinx - ジェームズ wrote:
>> >On 6 October 2016 at 11:19, Martinx - ジェームズ
>> ><thiagocmartinsc at gmail.com> wrote:
>> >
>> >>
>> >>
>> >> On 6 October 2016 at 10:55, Martinx - ジェームズ
>> >> <thiagocmartinsc at gmail.com> wrote:
>> >>
>> >>>
>> >>>
>> >>> On 6 October 2016 at 07:22, Ralf Mardorf <silver.bullet at zoho.com>
>> >>> wrote:
>> >>>> On Thu, 06 Oct 2016 12:29:29 +0200, Oliver Grawert wrote:
>> >>>> >hi,
>> >>>> >Am Mittwoch, den 05.10.2016, 21:58 -0400 schrieb Martinx -
>> >>>> >ジェームズ:
>> >>>> >>
>> >>>> >> >
>> >>>> >> BTW, here is htop showing that my RAM is 100% being used by
>> >>>> >> nothing!
>> >>>> >>
>> >>>> >> http://imgur.com/a/1nKkL
>> >>>> >
>> >>>> >and if you click on the "MEM%" there (or hit shift+M) htop will
>> >>>> >actually show you what that "nothing" is by sorting by memory
>> >>>> >usage ;)
>> >>>>
>> >>>> Good point,
>> >>>>
>> >>>> which btw. works for top and atop, too, as q instead of Ctrl+C does
>> >>>> either. I don't know why I mentioned Ctrl+C in a previous mail :D.
>> >>>>
>> >>>> However, I would use top or atop instead of htop, both IMO are
>> >>>> better readable, regarding default colours and provided
>> >>>> buffer/cache info, but only top might allow to easily copy the
>> >>>> output.
>> >>>>
>> >>>> Regards,
>> >>>> Ralf
>> >>>>
>> >>>
>> >>> Aha! Thank you guys for all replies!
>> >>>
>> >>> It is not cache mem... Look what I found (thanks to Ralf):
>> >>>
>> >>> df -h
>> >>> tmpfs                     16G  241M   16G   2% /dev/shm
>> >>> tmpfs                     16G     0   16G   0% /sys/fs/cgroup
>> >>>
>> >>> Looks like that I found my missing 32G of ram! How to fix it?
>> >>>
>> >>> Cheers!
>> >>> Thiago
>> >>>
>> >>
>> >> Oops...
>> >>
>> >> df -h
>> >> Filesystem            Size  Used Avail Use% Mounted on
>> >> tmpfs                     16G  241M   16G   2% /dev/shm
>> >> tmpfs                     16G     0   16G   0% /sys/fs/cgroup
>> >>
>> >> Looks like that it is not being used but, it is pre-allocated?
>> >>
>> >
>> >Just added the following lines to /etc/fstab:
>> >
>> >none /dev/shm tmpfs defaults,size=2G        0 0
>> >tmpfs /sys/fs/cgroup tmpfs rw,nosuid,nodev,noexec,mode=755,size=2G 0 0
>> >
>> >Now, those 2 as limited to 2G each buuuut, system still shows all my
>> >RAM being occupied by Sanatas...  lol
>>
>> By default Linux tmpfs has got a size of half of the available memory.
>> You should stay with this default, unless you need more memory for
>> tmpfs. As you already noticed, the memory available for tmpfs isn't
>> used, it's just the limit. Regarding your output tmpfs does use only
>> 241M, so it is not the culprit.
>>
>> Did you sort the output of "top" by memory as described by Oli?
>>
>> Regards,
>> Ralf
>>
>>
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>
>
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