On 19.11.2014 09:21, Andy Lutomirski wrote:
On Mon, Nov 17, 2014 at 1:51 AM, Michel Dänzer <michel@xxxxxxxxxxx> wrote:
On 15.11.2014 07:21, Andy Lutomirski wrote:
On recent kernels (3.16 through 3.18-rc4, perhaps), doing anything
graphics intensive seems to cause my system to become unusable for
tens of seconds. Pointing Firefox at Google Maps is a big offender --
it can take several minutes for me to move my mouse far enough to
close the tab and get my computer back.
On bootup, I get this warning:
[drm:btc_dpm_set_power_state] *ERROR*
rv770_restrict_performance_levels_before_switch failed
Setting radeon.dpm=0 seems to work around this problem at the cost of
giving my rather slow graphics.
Are there known issues here?
Can you bisect the kernel, or at least isolate which kernel version first
introduced the problem?
With whatever userspace I'm running, I'm seeing it 3.13, 3.14, 3.15,
3.16, and 3.18-rc4+. I haven't tried other versions.
With radeon.dpm=0, I can still trigger short stalls (around one
second), but I seem unable to trigger long stalls easily. (I say
easily because, just as I was typing this email, my system stalled for
about a minute.)
I can only think of two things offhand that could cause such extremely
long stalls: Swap thrashing or IRQ storms.
With a setup where you can easily trigger long stalls, can you try
getting a CPU profile for a stall with sysprof or perf?
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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