Long radeon stalls on recent kernels

[Andy Lutomirski]

On Tue, Nov 18, 2014 at 4:21 PM, Andy Lutomirski <luto at amacapital.net> wrote:
> On Mon, Nov 17, 2014 at 1:51 AM, Michel Dänzer <michel at daenzer.net> wrote:
>> On 15.11.2014 07:21, Andy Lutomirski wrote:
>>>
>>> I have a Caicos card, like this:
>>>
>>> [    3.077260] [drm] radeon kernel modesetting enabled.
>>> [    3.077338] checking generic (e0000000 600000) vs hw (e0000000
>>> 10000000)
>>> [    3.077339] fb: switching to radeondrmfb from EFI VGA
>>> [    3.077377] Console: switching to colour dummy device 80x25
>>> [    3.078881] [drm] initializing kernel modesetting (CAICOS
>>> 0x1002:0x6779 0x174B:0xE164).
>>> [    3.078903] [drm] register mmio base: 0xF4A20000
>>> [    3.078904] [drm] register mmio size: 131072
>>> [    3.078982] ATOM BIOS: C26401
>>> [    3.079572] radeon 0000:09:00.0: VRAM: 1024M 0x0000000000000000 -
>>> 0x000000003FFFFFFF (1024M used)
>>> [    3.079574] radeon 0000:09:00.0: GTT: 1024M 0x0000000040000000 -
>>> 0x000000007FFFFFFF
>>> [    3.079576] [drm] Detected VRAM RAM=1024M, BAR=256M
>>> [    3.079577] [drm] RAM width 64bits DDR
>>> [    3.079755] [TTM] Zone  kernel: Available graphics memory: 8186568 kiB
>>> [    3.079757] [TTM] Zone   dma32: Available graphics memory: 2097152 kiB
>>> [    3.079757] [TTM] Initializing pool allocator
>>> [    3.079773] [TTM] Initializing DMA pool allocator
>>> [    3.080011] [drm] radeon: 1024M of VRAM memory ready
>>> [    3.080012] [drm] radeon: 1024M of GTT memory ready.
>>> [    3.080049] [drm] Loading CAICOS Microcode
>>> [    3.080330] [drm] Internal thermal controller without fan control
>>> [    3.081425] [drm] radeon: power management initialized
>>> [    3.081551] [drm] GART: num cpu pages 262144, num gpu pages 262144
>>> [    3.082589] [drm] enabling PCIE gen 2 link speeds, disable with
>>> radeon.pcie_gen2=0
>>> [    3.085030] [drm] PCIE GART of 1024M enabled (table at
>>> 0x0000000000274000).
>>> [    3.085221] radeon 0000:09:00.0: WB enabled
>>> [    3.085224] radeon 0000:09:00.0: fence driver on ring 0 use gpu
>>> addr 0x0000000040000c00 and cpu addr 0xffff88043d914c00
>>> [    3.085225] radeon 0000:09:00.0: fence driver on ring 3 use gpu
>>> addr 0x0000000040000c0c and cpu addr 0xffff88043d914c0c
>>> [    3.097438] radeon 0000:09:00.0: fence driver on ring 5 use gpu
>>> addr 0x0000000000072118 and cpu addr 0xffffc900128b2118
>>> [    3.097441] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
>>> [    3.097442] [drm] Driver supports precise vblank timestamp query.
>>> [    3.097514] radeon 0000:09:00.0: irq 56 for MSI/MSI-X
>>> [    3.097544] radeon 0000:09:00.0: radeon: using MSI.
>>> [    3.097614] [drm] radeon: irq initialized.
>>>
>>> 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 could be wrong here, but I think that radeon.dpm=0,
power_profile=default is okay, but radeon.dpm=0, power_profile=high is
bad.

--Andy

>
> --Andy
>
>>
>>
>> --
>> Earthling Michel Dänzer            |                  http://www.amd.com
>> Libre software enthusiast          |                Mesa and X developer
>
>
>
> --
> Andy Lutomirski
> AMA Capital Management, LLC



-- 
Andy Lutomirski
AMA Capital Management, LLC