Adapt tuned recommend heuristics for CentOS and Fedora server variants

[jeremyeder]

All server variants should have throughput-performance as their out-of-the-box tuned profile. This has been the default for RHEL since 7.0 GA.

http://jperrin.org/centos/boosting-centos-server-performance/ https://twitter.com/gbraad/status/910899164535431168

[jperrin]

I'm uncertain how within CentOS (or fedora for that matter) we'd identify the difference between server or laptop when the underlying package set is the same.

[jeremyeder]

tuned 2.9 has the recommend.d feature.

[jeremyeder]

Jim, what about the content of /etc/os-release?

[yarda]

@jperrin in Tuned at the moment you can regex match content of the /etc/system-release-cpe, output of the virt-what tool, presence of the arbitrary process or content of any file to determine the profile. If there is any difference between the server / laptop it should work. At the moment we cannot match output of the arbitrary executable, but we can add it to the next release.

[jperrin]

So we'll have to sort this out on our side, but this fix should make it easier on our side. Because we don't differentiate between install types (laptop vs server) we have to figure out either how we want to do this, or if it's worth changing.

[yarda]

Feel free to do pull request or let us know how to detect it, we are ready to add/support it upstream. Also I can look onto it later myself (at the moment I do not have Fedora server / CentOS handy).