[Bug 34377] New: Radeon driver PCIe throughput not up to PCIe2.0 levels

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34377

           Summary: Radeon driver PCIe throughput not up to PCIe2.0 levels
           Product: Mesa
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R600
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: lucvermoesen at gmail.com


Created an attachment (id=43476)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43476)
test data and test program for PCIe gen2 issue

On an HD5450 card, when I load the latest gallium3D driver with kernel
2.6.38-rc4 and firmware I got from
http://people.freedesktop.org/~agd5f/radeon_ucode/ , this together with the
latest git checkouts for X and modules (and thus also xf86-video-ati) and
latest mesa git checkout that has been built with –enable-gallium-r600

installing the radeon kernel module with 
modprobe radeon modeset=1 pcie_gen2=1


Then I get 0.5GB/s CPU->GPU