DPM on Radeon HD6570

[Alex Deucher]

On Wed, Aug 21, 2013 at 1:49 PM, Boszormenyi Zoltan <zboszor at pr.hu> wrote:
> Hi,
>
> thanks for your response.
>
> 2013-08-21 17:39 keltezéssel, Alex Deucher írta:
>
>> On Wed, Aug 21, 2013 at 10:31 AM, Boszormenyi Zoltan <zboszor at pr.hu>
>> wrote:
>>>
>>> Hi,
>>>
>>> I read this Phoronix article:
>>> http://www.phoronix.com/scan.php?page=article&item=amd_hd6000_dpm&num=1
>>>
>>> Congrats to the progress achieved so far.
>>>
>>> However, I can see an interesting deviation for HD6570 from the
>>> observed trend of other chips.
>>>
>>> r600g can reach 80+ percent of the performance of Catalyst
>>> for most HD6xxx chips except for 6570, where the performance
>>> is around 10-20 percent.
>>>
>>> Do you have a theory about this difference?
>>> Maybe DPM doesn't work as intended on HD6570?
>>>
>> Are you seeing the same results on your board?  If so are the results
>> roughly the same with dpm enabled vs. disabled?  If so I doubt there
>> is a problem with dpm.  On older dGPUs like this one dpm won't really
>> improve performance since the cards come up with relatively high
>> clocks by default.  It's mainly for saving power when the GPU is idle.
>
>
> I have enabled dpm:
> $ cat /proc/cmdline
> BOOT_IMAGE=/vmlinuz-3.11.0-0.rc6.git0.1.fc20.x86_64
> root=UUID=00df37a2-be3d-46fe-963a-ca08977fc5f6 ro quiet rhgb radeon.audio=1
> radeon.dpm=1 LANG=hu_HU.UTF-8
>
> I have just tried "openarena 0.8.5" again with forced "low" performance.
> Results is 26.87fps with low performance, 59.40-59.70fps with forced high
> performance.
>

Sounds like you are refresh rate limited.  Try disabling
swapbufferswait in your xorg.conf:

Section "Device"
        Identifier  "card0"
        Driver      "iradeon"
        Option "SwapbuffersWait" "false"
EndSection

and disable vsync in the 3D driver, set env var:
vblank_mode=0

Also what does the performance look like with dpm disabled?

Anyway, it doesn't sound like dpm is an issue.

Alex

>
>>
>>> I have this kind of video card, so I wanted to test it myself.
>>> The exact model of my card is:
>>>
>>> http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1087&pid=1176&psn=&lid=1&leg=0#
>>>
>> Note that a lot of 6570 cards, including yours use DD3 memory rather
>> than GDDR5 so they will have fairly limited memory bandwidth.
>
>
> I know. The 6570 tested by Phoronix must be GDDR5
> but it's not mentioned specifically.
>
> Best regards,
> Zoltán Böszörményi
>
>
>>
>> Alex
>>
>>> I have installed kernel 3.11-rc6 on Fedora 19 using this koji kernel:
>>> http://koji.fedoraproject.org/koji/buildinfo?buildID=457463
>>>
>>> I haven't tested Catalyst but my r600g results mostly match
>>> the ones in the article even with a different CPU.
>>>
>>> Best regards,
>>> Zoltán Böszörményi
>>>
>>> _______________________________________________
>>> dri-devel mailing list
>>> dri-devel at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>