[Bug 1378789] Re: [SRU] Set the default IO scheduler to CFQ in Kubuntu Trusty

[Adam Porter]

Thank you for making this change, finally.

I'd just like to point out that Baloo is far from the only thing that
uses ionice.  mlocate even uses it by default when it's available.  I
also use it extensively in backup scripts and other long-running
background operations.  I even use it for Dropbox (which does a lot of
I/O on startup).

Frankly, I consider it a bug that deadline doesn't support ionice.
Desktop systems commonly have background I/O operations running
nowadays, and ionice is crucial for preventing such operations from
harming interactive responsiveness.  It's my understanding that deadline
was only intended for servers and SSDs in the first place, so perhaps
its use in other Ubuntu variants on HDDs should be revisited

Or we could use BFQ on desktops and kiss all these problems goodbye...if
only the kernel team would build it...  (I've tried applying the patches
to a current Ubuntu kernel, but it's a real mess since they aren't kept
in sync.  If the kernel team would build it with the kernel--not
necessarily set it as default, just build it--then people could use it,
experiment with it, and gather data about it.  Just watch the videos
made by the BFQ devs on YouTube--they clearly show that it's worth it!)

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Title:
  [SRU] Set the default IO scheduler to CFQ in Kubuntu Trusty

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