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I believe that per-subvolume compression is not available yet. From the BTRFS wiki: Most mount options apply to the whole filesystem, and only the options for the first subvolume to be mounted will take effect. This is due to lack of implementation and may change in the future. This means that (for example) you can't set per-subvolume nodatacow, ...


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Since Raring (13.04), perf is built without Python scripting enabled “to avoid a Python build dependency”. This came as a nasty shock to people like me who used perf in 12.04 LTS and upgraded to 14.04 LTS. This is documented in the debian-master/changelog file in the Ubuntu kernel git repos. In short, if your kernel is 3.8.0-6.11 or later, you are — to use ...


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boot performance under systemd can be measured with the systemd-analyze plot tool. Realize that Ubuntu running systemd is very similar to Debian, which is very similar to every other GNU/Linux distro.


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A particular flavor of top that we use here is htop. Still CLI based but much more 'graphical'. Install it with: sudo apt-get install htop


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If everything works fine in the guest session, you can use the following very simple system to get a performant system again: Go to System Settings User Accounts + and add a user with the same name as your current user but with a 2 attached to the end. In below procedure "User" and "User2" will be used. Now, Log in as User2 Open the file manager ...


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htop, which can be installed and run from the Terminal, can be used to show you what apps use a lot of the CPU. It has scrolling, which makes it easier to use than top. System Monitor is a built in application that is the equivalent to Windows Task Manager, and is a graphical alternative to top and htop.


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You should try forcing the acpi-cpufreq scaling driver. To do so, edit (as sudo) the /etc/default/grub file and change the "GRUB_CMDLINE_LINUX_DEFAULT" line, adding this (and my example has some other stuff for my case that was there before): GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 intel_pstate=disable crashkernel=384M-:128M" Then run: sudo ...



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