Created attachment 43476 [details] 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.
Note: classic r600 driver has been abandoned. Please use r600g (gallium driver) instead. Is this still an issue with a newer driver/kernel?
It`s all OK, you video card is very limited by GPU perfomance.
2011-02-17 01:12:43 UTC Ohhh~
pcie 2 mode has been enabled by default for a while now. Also, most recent motherboards bring up the card in pcie 2 mode by default. HD5450 cards tend to have slower ddr3 vram rather than the faster gddr5 as higher end cards do. Is this still an issue with a more recent kernel and mesa?
The classic r600 driver has been abandoned long ago. It was replaced by the Gallium driver r600g. If you have issues with r600g please file a new bug report with component Drivers/Gallium/r600 Thanks.
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