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: [email protected]
ReportedBy: [email protected]
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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