On Wed, 08 Aug 2012 19:35:12 +0100 Chris Wilson wrote: > On Wed, 8 Aug 2012 16:42:36 +0300, Mihai Donțu 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). >
Looks like I'm missing that field: $ cat /sys/kernel/debug/dri/0/i915_drpc_info RC information accurate: yes Video Turbo Mode: yes HW control enabled: yes SW control enabled: no RC1e Enabled: no RC6 Enabled: yes Deep RC6 Enabled: no Deepest RC6 Enabled: no Current RC state: RC6 Core Power Down: no RC6 "Locked to RPn" residency since boot: 0 RC6 residency since boot: 3599731174 RC6+ residency since boot: 0 RC6++ residency since boot: 0 xorg sees the device as: "Integrated Graphics Chipset: Intel(R) Sandybridge Mobile (GT2+)" while lspci says: "00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)" I suppose that this particular GPU does not support dynamic clocking. :| -- Mihai Donțu _______________________________________________ [email protected]: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: [email protected]
