On Wed, 8 Aug 2012 16:42:36 +0300, Mihai DonÈu <[email protected]> wrote: > On Tue, 07 Aug 2012 17:28:40 +0100 Chris Wilson wrote: > > There have bugs where the cacheability flags of the pages in memory > > have been lost over suspend and resume, and where the GPU became > > stuck in a low power mode. So such degradation of performance over > > time is not unheard of. One of the key questions is if we have no > > errors reported how do the performance characteristics of the system > > vary over time? Running x11perf along with the benchmarks from > > intel-gpu-tools would be a good way to get some results that should > > help give some insight as to what changes. Along with comparing perf > > profiles over time. > > > > Are there any specific x11perf tests I should be looking at? Or should > I just script the run of all supported tests? There are many. :-)
"-copywinwin500 -putimage500 -aa10text" should give enough coverage to suggest the next step. > I'm looking into intel-gpu-tools too. Btw: how can I find out if the > GPU is stuck in a low power mode? cat /sys/kernel/debug/dri/0/i915_drpc_info, the CAGF field is the current frquency (presuming you have a GPU that supports dynamic clocking). -Chris -- Chris Wilson, Intel Open Source Technology Centre
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