[Bug 57281] New: Radeon: Bad performance and power consumption

[Bug 57281] New: Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281

           Summary: Radeon: Bad performance and power consumption
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.8.2-pf
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: ka.nick@mail.ru
        Regression: No


Created an attachment (id=100261)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=100261)
lspci -vv output

After upgrading my AMD E-450-based notebook to a newer one (HP 4545s
A4-3300-based) i noticed that in spite of noticeable higher clock rate the
video performance is about 15-20% worse than on E-450. It also got much hotter
initially, which I could cure by passing pcie_aspm=force to the kernel. In
spite of this I still have a feeling that it probably eats more power than it
should (which I can not prove with numbers, of course) comparing to E-450 (and
fglrx) experience. (Yes, I know the proprietary driver performs better in terms
of power management, too, but the question is to what extent?) Anyways, it
shouldn't underperform the older and weaker model...

It also shows the message at boot time:
[drm:radeon_acpi_init] *ERROR* Cannot find backlight controller
but it seems to work fine after that. (Shall I post another bug on this?)

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[Bug 57281] Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281





--- Comment #1 from Nick <ka.nick@mail.ru>  2013-04-29 12:34:50 ---
Created an attachment (id=100271)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=100271)
Kernel config

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[Bug 57281] Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281


Nick <ka.nick@mail.ru> changed:

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[Bug 57281] Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281


Nick <ka.nick@mail.ru> changed:

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 Attachment #100271|application/octet-stream    |text/plain
          mime type|                            |




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[Bug 57281] Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281


Alex Deucher <alexdeucher@gmail.com> changed:

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                 CC|                            |alexdeucher@gmail.com




--- Comment #2 from Alex Deucher <alexdeucher@gmail.com>  2013-04-29 14:31:27 ---
Please attach your dmesg output.

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[Bug 57281] Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281





--- Comment #3 from Michel Dänzer <michel@daenzer.net>  2013-04-29 14:41:09 ---
(In reply to comment #0)
> After upgrading my AMD E-450-based notebook to a newer one (HP 4545s
> A4-3300-based) i noticed that in spite of noticeable higher clock rate the
> video performance is about 15-20% worse than on E-450.

How did you measure that?

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[Bug 57281] Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281





--- Comment #4 from Nick <ka.nick@mail.ru>  2013-04-30 11:53:07 ---
Created an attachment (id=100301)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=100301)
dmesg output

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[Bug 57281] Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281





--- Comment #5 from Nick <ka.nick@mail.ru>  2013-04-30 11:53:33 ---
Created an attachment (id=100311)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=100311)
Xorg.0.log

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[Bug 57281] Radeon: Bad performance and power consumption

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--- Comment #6 from Nick <ka.nick@mail.ru>  2013-04-30 12:14:25 ---
(In reply to comment #3)
> (In reply to comment #0)
> > After upgrading my AMD E-450-based notebook to a newer one (HP 4545s
> > A4-3300-based) i noticed that in spite of noticeable higher clock rate the
> > video performance is about 15-20% worse than on E-450.
> 
> How did you measure that?
- gtkperf (which is the only "test" that shows an improvement about 30%)
- compiz benchmark (shows a regression)
- glxgears in both "dafault window" and full-screen modes - shows a regression,
too. 
(Yes, I'm aware it's NOT a benchmark, for instance I noticed it's very
dependent on CPU part: simple change of a CPU governor may change figures
dramatically, and so on...) But in my case (I use exactly the same environment
except the hardware) its numbers apparently correspond well to what I "look and
feel" while using the computer: how smooth the  cube rotates, firefox scrolls,
etc. Unfortunately, it *is* slower, hotter and gives a shorter battery life...
And while I found open source driver on E-450 quite usable, I've to switch to
fglrx on my new notebook so far -- having all it's disadvantages and
headaches...

BTW, if you can suggest a reliable benchmark, I could do the measurements...

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[Bug 57281] Radeon: Bad performance and power consumption

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--- Comment #7 from Michel Dänzer <michel@daenzer.net>  2013-04-30 13:32:46 ---
Does not enabling Option "BackingStore" in xorg.conf help?

The high power usage might be due to the discrete GPU being powered on, but the
X server isn't using it, so it doesn't help performance.

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[Bug 57281] Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281





--- Comment #8 from Nick <ka.nick@mail.ru>  2013-05-01 07:32:39 ---
According to powertop it saves about 0.5W or a little bit more. Not a
break-thru but still useful. Thanks!

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[Bug 57281] Radeon: Bad performance and power consumption

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--- Comment #9 from Michel Dänzer <michel@daenzer.net>  2013-05-01 07:49:06 ---
(In reply to comment #8)
> According to powertop it saves about 0.5W or a little bit more.

That's just from not enabling backing store? Not bad, considering backing store
is basically useless with a composited desktop and probably hurts performance.
:)

I suspect powering off the discrete GPU could save a lot more than that though.

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[Bug 57281] Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281





--- Comment #10 from Nick <ka.nick@mail.ru>  2013-05-02 15:13:06 ---
It's already off... The first thing to do if you don't want you laptop to die
in 1.5 hr :-)

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[Bug 57281] Radeon: Bad performance and power consumption

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t3st3r@mail.ru changed:

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--- Comment #11 from t3st3r@mail.ru  2013-06-16 18:38:35 ---
For me this problem happens as following: 

My HD5770 card could clock up to 850MHZ - highest state, 600MHz in medium power
profile and 150MHz is low power profile.

However automatic management (dynpm) would only cycles 600 and 850MHz clocks
and never goes to 150MHz unless I explicitly force power profile to low. Should
I tell such power management is dumb? It is! 

You can be pretty sure that down-clocking 850MHz card to 600MHz does not makes
big difference. However down-clocking to 150MHz makes a really drastic
difference in power consumption and cooler noize. Should I admit current Radeon
dynpm implementation suxx?

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