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

* [Bug 34377] New: Radeon driver PCIe throughput not up to PCIe2.0 levels
@ 2011-02-17  9:12 bugzilla-daemon
  2012-11-02 16:37 ` [Bug 34377] " bugzilla-daemon
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: bugzilla-daemon @ 2011-02-17  9:12 UTC (permalink / raw)
  To: dri-devel

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@lists.freedesktop.org
        ReportedBy: lucvermoesen@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 
From GPU -> CPU, I get about the same 0.5GB/s.

When I load the fglrx ati proprietary driver (11.1) for the 5450 card, then I
get throughputs of about 2GB/s in both directions. 

Running the same test in same environment on the HD5970 
with the gallium drivers and kernel mode setting and pcie_gen2 activation, i
get about the same figures as above.
With fglrx for 5970, then 5970 only performs well in CPU->GPU with about 2GB/s
and only 0.5GB/s in GPU->CPU direction 

I have included the test and configuration output for both cases (fglrx and
radeon) and also code for the testprogram might you want to reproduce this
case.

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