Re: DPM on Radeon HD6570

[Boszormenyi Zoltan <zboszor@pr.hu>]

2013-08-21 19:55 keltezéssel, Alex Deucher írta:
> On Wed, Aug 21, 2013 at 1:49 PM, Boszormenyi Zoltan<zboszor@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@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

vblank_mode was already 0 before:

[zozo@localhost ~]$ cat .drirc
<driconf>
     <device screen="0" driver="r600">
         <application name="Default">
             <option name="fthrottle_mode" value="2" />
             <option name="pp_celshade" value="0" />
             <option name="pp_jimenezmlaa" value="0" />
             <option name="always_have_depth_buffer" value="false" />
             <option name="pp_jimenezmlaa_color" value="0" />
             <option name="pp_nogreen" value="0" />
             <option name="force_glsl_extensions_warn" value="false" />
             <option name="pp_nored" value="0" />
             <option name="disable_glsl_line_continuations" value="false" />
             <option name="vblank_mode" value="0" />
             <option name="allow_large_textures" value="1" />
             <option name="pp_noblue" value="0" />
         </application>
     </device>
</driconf>

I have added this:

[root@localhost xorg.conf.d]# pwd
/etc/X11/xorg.conf.d
[root@localhost xorg.conf.d]# cat 99-vblank.conf
Section "Device"
     Identifier    "card0"
     Driver        "radeon"
     Option        "SwapbuffersWait" "false"
EndSection

With forced high performance, I got 118.73 fps. Wow. :-)

> Also what does the performance look like with dpm disabled?

Same as forced high with dpm enabled.

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

Indeed, dpm works as intended.
Something was misconfigured at Phoronix then.

Thanks for resolving this for me,
Zoltán Böszörményi

>
> 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
>>>>
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