Lag after resume culprit found

Johannes Lundberg <[email protected]>
Newsgroups gmane.os.freebsd.devel.x11,gmane.os.freebsd.current
Message-ID <CAECmPwtULDe9GGK0PhnUa7_n=zxripJj9nh5m0RTF9XqKhXKYQ@mail.gmail.com> 
https://github.com/freebsd/freebsd/commit/66f063557f257baa9c8aeab9f933171eaa6e1cfa
x86 cpususpend_handler: call wbinvd after setting suspend state bits

How to test (i915kms)

Start X with glxgears
Confirm running stable at 60 fps
suspend/resume (S3)
glxgears is now fluctuating between 10-40 fps.


Way past bedtime now so I stop here for today.

Note: cross-posting - please think before "reply-to-all"

/Johannes
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