dmesg command give me that result in particular:
[0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups
What does it meanings and how to know what I want around my 'memory cgroups' ?
cgroups (control groups) are used mainly by LXC (LinuX Containers) and its "memory cgroup" is for process group memory restriction. Unless you need this stuff it's better to disable this feature, since otherwise it consumes a part of RAM for its internal structures and CPU can be affected as well.