Comment 0 for bug 1839750

Mesa's RADV performance has dropped nearly 40% across multiple applications since upgrading my HWE kernel to 5.0.0-23.

Reverting to the 4.18 kernel fixed the issue. The problem was still present when testing kernel 5.2.8 from the Ubuntu mainline PPA.

My hardware:
AMD Radeon RX 570
AMD Ryzen 7 1700X
Asrock B450M Pro4 motherboard

Tested kernels:
4.18.0-25 (good)
5.0.0-23 (bugged)
5.2.8-050208 (bugged)

Tested versions of Mesa, ALL suffered performance loss under the bugged kernels:
19.0.2 from the repository
19.1.2 stable from PPA
19.2-devel from PPA

Thanks for taking the time to look into this.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.0.0-23-generic 5.0.0-23.24~18.04.1
ProcVersionSignature: Ubuntu 5.0.0-23.24~18.04.1-generic 5.0.15
Uname: Linux 5.0.0-23-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Aug 11 04:15:28 2019
InstallationDate: Installed on 2019-02-01 (191 days ago)
InstallationMedia: Kubuntu 18.04.2 LTS "Bionic Beaver" - Beta amd64 (20190129)
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)