Nouveau - Feb 2014 - [Bug 75094] New: NV92 is faster and runs games fine than NVE6, why?

https://bugs.freedesktop.org/show_bug.cgi?id=75094

          Priority: medium
            Bug ID: 75094
          Assignee: nouveau at lists.freedesktop.org
           Summary: NV92 is faster and runs games fine than NVE6, why?
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: fast.rizwaan at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/DRI/nouveau
           Product: Mesa

Created attachment 94204
  --> https://bugs.freedesktop.org/attachment.cgi?id=94204&action=edit
9800 glxinfo - games and 3d performance is great

9800GT (nv92) looks more compatible, wine and other games performs better with
9800GT than nvidia 650ti (nve6)

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--- Comment #1 from Asif Ali Rizvan <fast.rizwaan at gmail.com> ---
Created attachment 94205
  --> https://bugs.freedesktop.org/attachment.cgi?id=94205&action=edit
650ti glxinfo - graphics are misisng and performance is somewhat poor

I'm just wondering, when it is using nouveau and has all the GL_ features,
why
9800 works better than 650ti?

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https://bugs.freedesktop.org/show_bug.cgi?id=75094

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Asif, I understand your frustration. However this is due to the lack of
reclocking in nouveau. Kepler cards are, by default, usually clocked at ~50MHz,
while your 9800 probably runs at 1GHz+. Since we can't (currently, reliably)
change clocks, you end up running at that default frequency, and it's no
surprise that the Kepler card is slower when its clocks are 1/20th of the speed
of the 9800.

There _is_ highly experimental reclocking available, feel free to try it out,
but this is a "will void warranty" type situation :) You'll need
to grab the
latest 3.14-rc, remove the "return -ENOSYS" in the pstate update
handler, and
potentially boot with nouveau.config=NvMemExec=1 if you're feeling
particularly
adventurous.

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--- Comment #3 from Matthias Nagel <matthias.h.nagel at gmail.com> ---
A pose this question only to make things more clear to me, because I own a
650TI, too. I have the following dmesg output during boot:

nouveau  [     DRM] 4 available performance level(s)
nouveau  [     DRM] 0: core 162MHz shader 324MHz memory 648MHz voltage 100mV
nouveau  [     DRM] 1: core 405MHz shader 810MHz memory 1080MHz voltage 80mV
nouveau  [     DRM] 2: core 1502MHz shader 3004MHz memory 1080MHz voltage 60mV
nouveau  [     DRM] 3: core 1502MHz shader 3004MHz memory 1080MHz voltage 40mV

Do I understand you correctly: Nouveau always uses level 0, this is to say
162MHz (for core), 324MHz (for shader) and 648MHz (for memory) regardless how
much work the card is faced with?

Thanks

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #3)
> A pose this question only to make things more clear to me, because I own a
> 650TI, too. I have the following dmesg output during boot:
> 
> nouveau  [     DRM] 4 available performance level(s)
> nouveau  [     DRM] 0: core 162MHz shader 324MHz memory 648MHz voltage
100mV
> nouveau  [     DRM] 1: core 405MHz shader 810MHz memory 1080MHz voltage
80mV
> nouveau  [     DRM] 2: core 1502MHz shader 3004MHz memory 1080MHz voltage
> 60mV
> nouveau  [     DRM] 3: core 1502MHz shader 3004MHz memory 1080MHz voltage
> 40mV
With newer kernels (3.13+), the output is a little different and you'll also
see a 'c' line which indicates the current speed. (I believe with
pre-3.13 you
also saw a 'c' line but it was probably empty for Kepler cards.) I'm
not sure
how accurate those readouts are for kepler on pre-3.13.

Like I said, nouveau can't change clock frequencies, so it'll be in
whatever
level the vbios leaves it in. (Which might not be one of the listed levels at
all!) Often, for Fermi and newer, it's the lowest or second-lowest one.

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--- Comment #5 from Matthias Nagel <matthias.h.nagel at gmail.com> ---
Thanks, that's all I wanted to know. And you are right. The line that starts
with "c" is empty on a 3.12.9 kernel.

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