Can 'someone' please open a bounty on creation of a VM test case, f.e. with 
`vagrant` or `phoronix test suite`?
Basically, a way to reproduce and quantify the perceived/actual performance 
difference between
> Linux 2.6.17 Released 17 June, 2006
and
> Linux 5.0 Released Sun, 3 Mar 2019 
…

(In reply to Alex Efros from comment #666)
> Not as bad as years ago […]
> And that's on powerful and modern enough system with
> kernel 4.19.27, CPU i7-2600K @ 4.5GHz, RAM 24GB, and HDD 3TB […]
> This is annoying, and I remember time before
> 12309 when rtorrent without any throttling won't make mplayer to freeze on
> less powerful hardware.

Oh yeah, this... i can clearly remember back then when on a then mid-
range machine with a lot of compiling (gentoo => 100% cpu �[U+1F923]�)
and filesystem work, VLC used to play an HD video stream even under
heavy load without any hiccups and micro-stuttering.. It was impressive
at the time.. and then.. it broke �[U+1F928]�

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https://bugs.launchpad.net/bugs/336652

Title:
  Poor system performance under I/O load

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This bug seems to particularly affect the Dell Latitude D420, D430 and
  (from the kernel.org bug) at least the D830 laptop models; but others
  have been reported.

  Under I/O load, which need not be excessive - running usb-creator or
  even just checking one's email - the system performs remarkably
  poorly, far less than other laptop users see.  It can often take
  minutes to open a window, and sometimes the screen isn't repainted.
  Certainly most applications are "dimmed" by Compiz under I/O.

  It also appears to massively negatively affect boot performance, with
  one core spending its entire time in I/O wait - something we don't see
  elsewhere.

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