This issue persisted with the 5.0.0-25 kernel update. I later tested
again after updating Mesa to 19.0.8. No change.

** Description changed:

  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)
+ 5.0.0-25 (bugged)
  5.2.8-050208 (bugged)
  Tested versions of Mesa, ALL suffered performance loss under the bugged 
  19.0.2 from the repository
+ 19.0.8 from the repository
  19.1.2 stable from PPA
  19.2-devel from PPA
  Comparative performance testing was done through the benchmark tool of a
  native Vulkan game (Total War: Three Kingdoms), and in Steam titles
  using DXVK and Proton with the Steam framerate monitor.
  Here is the output of sudo lshw -C:
         description: VGA compatible controller
         product: Ellesmere [Radeon RX 470/480/570/570X/580/580X]
         vendor: Advanced Micro Devices, Inc. [AMD/ATI]
         physical id: 0
         bus info: pci@0000:23:00.0
         version: ef
         width: 64 bits
         clock: 33MHz
         capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
         configuration: driver=amdgpu latency=0
         resources: irq:46 memory:e0000000-efffffff memory:f0000000-f01fffff 
ioport:e000(size=256) memory:fe900000-fe93ffff memory:c0000-dffff
  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)

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  40% performance loss in Mesa with Linux 5.0

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