<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - R9 290 low performance in Linux 4.7" href="https://bugs.freedesktop.org/show_bug.cgi?id=97260#c10">Comment # 10</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - R9 290 low performance in Linux 4.7" href="https://bugs.freedesktop.org/show_bug.cgi?id=97260">bug 97260</a> from <a class="email" href="mailto:kai@dev.carbon-project.org" title="Kai <kai@dev.carbon-project.org>"> Kai</a> <pre>(In reply to Alex Deucher from <a href="show_bug.cgi?id=97260#c9">comment #9</a>) > (In reply to Kai from <a href="show_bug.cgi?id=97260#c8">comment #8</a>) > > (In reply to Alex Deucher from <a href="show_bug.cgi?id=97260#c6">comment #6</a>) > > > Does reverting 5e031d9fe8b0741f11d49667dfc3ebf5454121fd (drm/radeon/pm: > > > update current crtc info after setting the powerstate) help? > > > > No, it does not for me (I fetched the patch from > > <<a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/</a> > > ?id=5e031d9fe8b0741f11d49667dfc3ebf5454121fd> and applied it with patch -p1 > > -R < /path/to.patch). The Talos Principle is still down to 43 FPS, haven't > > tested XCOM 2 or anything else. > > > > Btw, not sure if it can help tracking down the cause: the GPU doesn't seem > > to go into its highest performance mode or at least the fan is not reaching > > its highest RPM when I'm on 4.7.0 (with or without the revert). > > You can check by running apps and monitoring the content of > /sys/kernel/debug/dri/64/radeon_pm_info > Do you see it scaling up under load on the problematic kernels? Does > forcing the clocks to high via sysfs work ok? While the clocks *do* scale up on 4.7.0, it doesn't go as high as 4.6.4. On 4.6.4 I'm reaching the maximum clocks for my GPU (power level avg sclk: 98000 mclk: 125000). With 4.7.0 the highest I'm seeing is "power level avg sclk: 90843 mclk: 125000" and the overall level is way lower (lots of sclk values starting with a 3) compared to 4.6.4 where most values are > 60000 for sclk. Note: I used watch to dump /sys/kernel/debug/dri/64/radeon_pm_info every five seconds to a file. Between runs the actual numbers logged vary, but the general trend stays the same. Writing "high" to /sys/class/drm/card0/device/power_dpm_force_performance_level locks the clock indeed to the highest values (sclk: 98000 mclk: 125000) on 4.7.0 and recovers almost all of the lost performance. There's still a small hit to performance. Note: I've only tested "The Talos Principle" so far, if you need me to test XCOM 2 or other titles as well, let me know. Do you still need the bisect?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>