| Bug ID | 84662 |
|---|---|
| Summary | Long pauses with Unreal demo Elemental on R9270X since : Always flush the HDP cache before submitting a CS to the GPU |
| Product | Mesa |
| Version | git |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | Drivers/Gallium/radeonsi |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | adf.lists@gmail.com |
R9270X PCIE 2.0 2 gig vram 4 gig ram. Unreal demo Elemental only recently started working with git llvm/mesa, do no bisection done on these. The demo even when working is very broken - constant 1/4 sec stutters with a couple of 1/2 - 1 sec. But after - commit 4439d469706699b4e69ef410ebc9115339f6e9e6 Author: Michel Dänzer <michel.daenzer@amd.com> Date: Thu Jul 31 18:43:49 2014 +0900 drm/radeon: Always flush the HDP cache before submitting a CS to the GPU This ensures the GPU sees all previous CPU writes to VRAM, which makes it safe: * For userspace to stream data from CPU to GPU via VRAM instead of GTT * For IBs to be stored in VRAM instead of GTT * For ring buffers to be stored in VRAM instead of GTT, if the HPD flush is performed via MMIO There are far longer pauses of many seconds - run time to unreal logo on "good" is 3:45 on bad best 5:39 can be longer. Screens to be attached show quite different vram/gtt usage between good and bad. Related to https://bugs.freedesktop.org/show_bug.cgi?id=82050 I bisected to the same commit in that bug, but applying the mesa patch https://bugs.freedesktop.org/show_bug.cgi?id=82050#c19 doesn't help here. CONFIG_CMA is not set. Tried kernel org 3.17-rc7 as it was reported in above as working, but not for me.
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