I managed to pinpoint the issue. The stuttering is caused by enabling TearFree via xrandr. When on `auto`, there is no stuttering, but when enabled by setting it to `on`, there is intense stuttering noticeable when dragging windows around, but it's also very noticeable when just moving the mouse around on the desktop with no windows open.
I use Openbox with Compton for compositing.

-Dawson Dias

On Sat, Mar 10, 2018 at 11:32 AM, Dawson Dias <thexerothermicsclerodermoid-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
Got it. Attachments next time.

I started a git bisect but noticed there were updates pushed to the tree, so I built HEAD instead (d1eeebbd78fd185988c3c90e3dab304cc8b86c4e). The stuttering is now gone!

-Dawson Dias

On Fri, Mar 9, 2018 at 7:36 PM, Michel Dänzer <michel-otUistvHUpPR7s880joybQ@public.gmane.org> wrote:
On 2018-03-09 12:30 PM, Dawson Dias wrote:
> Hello
>
> I'm experiencing extreme stuttering in X on my Ryzen 2400G. This
> stuttering can be noticed even while only moving the mouse.
> Said stuttering does not exist under Wayland.
>
> This constant stuttering started on 2018-03-07 with the patches that
> were pushed on that day. Stuttering occurs on both branches
> drm-next-4.17 (f6c3b601bd490eda08c27b03607448abd4b4841b) and
> drm-next-4.17-wip (6896a66bc6d0fcb69b6be564fa43f02c09348b72).
>
> dmesg.log <https://bpaste.net/raw/06e6dcc4545b>
> journalctl.log <https://bpaste.net/raw/f6f3dc8d108d>

In the future, please attach files directly instead of referencing a
paste site.


> What sort of information do we require to pinpoint the source of this
> regression and fix it?

Ideal would be if you can use git bisect to isolate the individual
commit which introduced the stuttering.


--
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer