[Bug 84648] New: Lag/Pause When VRAM->GTT or GTT->VRAM transfer occur

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84648

            Bug ID: 84648
           Summary: Lag/Pause When VRAM->GTT or GTT->VRAM transfer occur
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: b747xx at gmail.com

Created attachment 107298
  --> https://bugs.freedesktop.org/attachment.cgi?id=107298&action=edit
HUD showing FPS drop and mem transfer

I got an lag / pause (stopping for one to +- 5 seconds) when I get transfer of
memory from the VRAM to GTT and the opposite, the GTT to VRAM.

It append only on Minecraft (No problem with EVE-Online & Source Engine games),
even sometime when it is not on the screen, and in that case, the whole X ui
stay locked until the transfer finish. It usually go fine until the VRAM reach
between 280-300MB and it start playing with the GTT.

The bug Append with:
Kernel 3.17-rc2+ (did not test the RC1, 3.16 was fine)
Mesa GIT newer than somewhere in the beginning of september.

Note that these don't need to be recent for the two. A old kernel with a new
Mesa and a new Kernel with a old Mesa recreate the problem. Having the latest
GIT of the two don't fix the problem. (I did in fact update libdrm, llvm, mesa,
xf86.... after upgrading the kernel to rc2, thinking something changed and was
requiring a newer mesa.

I have attached a screenshot with the Gallium hud showing the FPS and memory.

PS : I thought initially that it was the same as BUG #82050 but got requested
to file another bug.

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