Re: [Intel-gfx] [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

Re: [Intel-gfx] [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Xiang, Haihao]

On Mon, 2014-11-03 at 13:48 +0100, Daniel Vetter wrote:
> On Fri, Oct 31, 2014 at 11:27:33AM +0200, Ville Syrjälä wrote:
> > On Thu, Oct 30, 2014 at 12:57:04PM -0700, Kenneth Graunke wrote:
> > > Before we get too much further...we should check if libva is actually broken.
> > > I don't know if this means the sampler palette completely doesn't work, or if
> > > it just means sample_c doesn't work with the palette.  If it's the latter,
> > > we're probably fine, because I doubt libva uses sample_c.
> >
> > Yeah if we wouldn't break any existing userspace I guess we could just
> > flip the switch in the kernel. If anyone later wants to start doing
> > something that no longer works they'd have to deal with disabling the
> > bit using an LRI.
> 
> It very much looks like libva uses palettes, since it supports C8 and C4
> image formats (well some crazy fourcc nonsense, but meh). And it does so
> on all generations support by the libva driver, i.e. including hsw afaict
> 
> Cc'ing people and lists with more clue who should be able to tell whether
> its not just there but actually works ...

Yes, libva driver uses sample (00000) and palette on HSW

Thanks
Haihao


> -Daniel


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[PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Kenneth Graunke]

Haswell significantly improved the performance of sampler_c messages,
but the optimization appears to be off by default.  Later platforms
remove this bit, and apparently always enable the optimization.

Improves performance in "Counter Strike: Global Offensive" by 18%
at default settings on Iris Pro.

This may break sampling of paletted formats (P8/A8P8/P8A8).  It's
unclear whether it affects sampling of paletted formats in general,
or just the sample_c message (which is never used).

While libva does have support for using paletted formats (primarily
for OSDs), that support appears to have been broken for at least a
year, so I couldn't observe a regression from this.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
---
 drivers/gpu/drm/i915/i915_reg.h | 1 +
 drivers/gpu/drm/i915/intel_pm.c | 4 ++++
 2 files changed, 5 insertions(+)

Resubmitting the patch to unconditionally enable this.  I tried to get
libva-intel to use paletted formats, and observe a regression...but the
only thing I found that used it was mplayer's OSD (on screen display).
Even without my patch, the colors were totally wrong with that, and it's
according to a few distro wikis, that's been the case for over a year.

If libva's code for paletted formats /is/ broken, they could always add
code to disable this bit using the command validator when fixing it.

Could we try merging this, and back it out if someone reports a
regression?  I haven't observed any problems.  It's also been quite
stable.

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 40ca873..0f32fd1a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6167,6 +6167,7 @@ enum punit_power_well {
 #define  HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE    (1 << 6)
 
 #define HALF_SLICE_CHICKEN3		0xe184
+#define   HSW_SAMPLE_C_PERFORMANCE	(1<<9)
 #define   GEN8_CENTROID_PIXEL_OPT_DIS	(1<<8)
 #define   GEN8_SAMPLER_POWER_BYPASS_DIS	(1<<1)
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7d99a9c..17e84dc 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5974,6 +5974,10 @@ static void haswell_init_clock_gating(struct drm_device *dev)
 	I915_WRITE(GEN7_GT_MODE,
 		   _MASKED_FIELD(GEN6_WIZ_HASHING_MASK, GEN6_WIZ_HASHING_16x4));
 
+	/* Make sample_c messages faster. */
+	I915_WRITE(HALF_SLICE_CHICKEN3,
+		   _MASKED_BIT_ENABLE(HSW_SAMPLE_C_PERFORMANCE));
+
 	/* WaSwitchSolVfFArbitrationPriority:hsw */
 	I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
 
-- 
2.2.1

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Re: [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[shuang.he]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he@intel.com)
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  363/364              363/364
ILK                 -1              364/366              363/366
SNB              +2-1              443/450              444/450
IVB                                  496/498              496/498
BYT                                  288/289              288/289
HSW              +2-6              542/564              538/564
BDW                                  415/417              415/417
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*ILK  igt_gem_fenced_exec_thrash_no-spare-fences-busy      PASS(2, M37)      DMESG_WARN(1, M37)
*SNB  igt_kms_flip_modeset-vs-vblank-race      DMESG_WARN(2, M35)      PASS(1, M35)
 SNB  igt_kms_flip_modeset-vs-vblank-race-interruptible      DMESG_WARN(2, M35M22)PASS(1, M35)      DMESG_WARN(1, M35)
 SNB  igt_kms_plane_plane-position-hole-pipe-B-plane-1      DMESG_WARN(1, M35)PASS(2, M35M22)      PASS(1, M35)
*HSW  igt_kms_flip_flip-vs-expired-vblank      PASS(2, M40)      DMESG_WARN(1, M40)
*HSW  igt_kms_flip_flip-vs-expired-vblank-interruptible      PASS(2, M40)      DMESG_WARN(1, M40)
*HSW  igt_kms_flip_nonexisting-fb      PASS(2, M40)      DMESG_WARN(1, M40)
*HSW  igt_kms_flip_nonexisting-fb-interruptible      PASS(2, M40)      DMESG_WARN(1, M40)
*HSW  igt_kms_flip_single-buffer-flip-vs-dpms-off-vs-modeset      PASS(3, M40M19)      DMESG_WARN(1, M40)
*HSW  igt_kms_plane_plane-panning-bottom-right-pipe-C-plane-1      TIMEOUT(2, M40)PASS(1, M19)      PASS(1, M40)
*HSW  igt_kms_plane_plane-position-hole-pipe-A-plane-2      PASS(2, M40)      DMESG_WARN(1, M40)
 HSW  igt_pm_rpm_modeset-non-lpsp-stress-no-wait      NSPT(1, M19)DMESG_WARN(1, M40)PASS(1, M40)      PASS(1, M40)
Note: You need to pay more attention to line start with '*'
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Re: [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Daniel Vetter]

On Wed, Dec 31, 2014 at 04:23:00PM -0800, Kenneth Graunke wrote:
> Haswell significantly improved the performance of sampler_c messages,
> but the optimization appears to be off by default.  Later platforms
> remove this bit, and apparently always enable the optimization.
> 
> Improves performance in "Counter Strike: Global Offensive" by 18%
> at default settings on Iris Pro.
> 
> This may break sampling of paletted formats (P8/A8P8/P8A8).  It's
> unclear whether it affects sampling of paletted formats in general,
> or just the sample_c message (which is never used).
> 
> While libva does have support for using paletted formats (primarily
> for OSDs), that support appears to have been broken for at least a
> year, so I couldn't observe a regression from this.
> 
> Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
> ---
>  drivers/gpu/drm/i915/i915_reg.h | 1 +
>  drivers/gpu/drm/i915/intel_pm.c | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> Resubmitting the patch to unconditionally enable this.  I tried to get
> libva-intel to use paletted formats, and observe a regression...but the
> only thing I found that used it was mplayer's OSD (on screen display).
> Even without my patch, the colors were totally wrong with that, and it's
> according to a few distro wikis, that's been the case for over a year.
> 
> If libva's code for paletted formats /is/ broken, they could always add
> code to disable this bit using the command validator when fixing it.
> 
> Could we try merging this, and back it out if someone reports a
> regression?  I haven't observed any problems.  It's also been quite
> stable.

Yeah makes sense. When resending please incorporated review feedback
(Ville dug out the wa name), I've done that. And I've pasted the
additional detail about the libva saga, just for reference (since no one
will remember that it's mplayer's OSD which uses this 2 months down the
road).

Also please cc libva mailing lists next time around as an fyi. Done that
too.

Queued for -next, thanks for the patch.
-Daniel

> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 40ca873..0f32fd1a 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6167,6 +6167,7 @@ enum punit_power_well {
>  #define  HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE    (1 << 6)
>  
>  #define HALF_SLICE_CHICKEN3		0xe184
> +#define   HSW_SAMPLE_C_PERFORMANCE	(1<<9)
>  #define   GEN8_CENTROID_PIXEL_OPT_DIS	(1<<8)
>  #define   GEN8_SAMPLER_POWER_BYPASS_DIS	(1<<1)
>  
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 7d99a9c..17e84dc 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -5974,6 +5974,10 @@ static void haswell_init_clock_gating(struct drm_device *dev)
>  	I915_WRITE(GEN7_GT_MODE,
>  		   _MASKED_FIELD(GEN6_WIZ_HASHING_MASK, GEN6_WIZ_HASHING_16x4));
>  
> +	/* Make sample_c messages faster. */
> +	I915_WRITE(HALF_SLICE_CHICKEN3,
> +		   _MASKED_BIT_ENABLE(HSW_SAMPLE_C_PERFORMANCE));
> +
>  	/* WaSwitchSolVfFArbitrationPriority:hsw */
>  	I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
>  
> -- 
> 2.2.1
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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Re: [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Kenneth Graunke]

[-- Attachment #1.1: Type: text/plain, Size: 2309 bytes --]

On Monday, January 05, 2015 02:19:15 PM Daniel Vetter wrote:
> On Wed, Dec 31, 2014 at 04:23:00PM -0800, Kenneth Graunke wrote:
> > Haswell significantly improved the performance of sampler_c messages,
> > but the optimization appears to be off by default.  Later platforms
> > remove this bit, and apparently always enable the optimization.
> > 
> > Improves performance in "Counter Strike: Global Offensive" by 18%
> > at default settings on Iris Pro.
> > 
> > This may break sampling of paletted formats (P8/A8P8/P8A8).  It's
> > unclear whether it affects sampling of paletted formats in general,
> > or just the sample_c message (which is never used).
> > 
> > While libva does have support for using paletted formats (primarily
> > for OSDs), that support appears to have been broken for at least a
> > year, so I couldn't observe a regression from this.
> > 
> > Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
> > ---
> >  drivers/gpu/drm/i915/i915_reg.h | 1 +
> >  drivers/gpu/drm/i915/intel_pm.c | 4 ++++
> >  2 files changed, 5 insertions(+)
> > 
> > Resubmitting the patch to unconditionally enable this.  I tried to get
> > libva-intel to use paletted formats, and observe a regression...but the
> > only thing I found that used it was mplayer's OSD (on screen display).
> > Even without my patch, the colors were totally wrong with that, and it's
> > according to a few distro wikis, that's been the case for over a year.
> > 
> > If libva's code for paletted formats /is/ broken, they could always add
> > code to disable this bit using the command validator when fixing it.
> > 
> > Could we try merging this, and back it out if someone reports a
> > regression?  I haven't observed any problems.  It's also been quite
> > stable.
> 
> Yeah makes sense. When resending please incorporated review feedback
> (Ville dug out the wa name), I've done that. And I've pasted the
> additional detail about the libva saga, just for reference (since no one
> will remember that it's mplayer's OSD which uses this 2 months down the
> road).
> 
> Also please cc libva mailing lists next time around as an fyi. Done that
> too.
> 
> Queued for -next, thanks for the patch.
> -Daniel

Oh, sorry, I missed that in the review.

Thanks, Daniel!

--Ken

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Re: [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Xiang, Haihao]

Hi Kenneth,

How did you test OSD ? I can't reproduce the issue you mentioned, OSD
works well for me when using mplayer-vaapi with the latest
libva/libva-intel-driver master branch.

I tried your patch, what surprised me is OSD still works well after
applying your patch. It seems your patch didn't disable the palette.

Thanks
Haihao


> On Monday, January 05, 2015 02:19:15 PM Daniel Vetter wrote:
> > On Wed, Dec 31, 2014 at 04:23:00PM -0800, Kenneth Graunke wrote:
> > > Haswell significantly improved the performance of sampler_c messages,
> > > but the optimization appears to be off by default.  Later platforms
> > > remove this bit, and apparently always enable the optimization.
> > > 
> > > Improves performance in "Counter Strike: Global Offensive" by 18%
> > > at default settings on Iris Pro.
> > > 
> > > This may break sampling of paletted formats (P8/A8P8/P8A8).  It's
> > > unclear whether it affects sampling of paletted formats in general,
> > > or just the sample_c message (which is never used).
> > > 
> > > While libva does have support for using paletted formats (primarily
> > > for OSDs), that support appears to have been broken for at least a
> > > year, so I couldn't observe a regression from this.
> > > 
> > > Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
> > > ---
> > >  drivers/gpu/drm/i915/i915_reg.h | 1 +
> > >  drivers/gpu/drm/i915/intel_pm.c | 4 ++++
> > >  2 files changed, 5 insertions(+)
> > > 
> > > Resubmitting the patch to unconditionally enable this.  I tried to get
> > > libva-intel to use paletted formats, and observe a regression...but the
> > > only thing I found that used it was mplayer's OSD (on screen display).
> > > Even without my patch, the colors were totally wrong with that, and it's
> > > according to a few distro wikis, that's been the case for over a year.
> > > 
> > > If libva's code for paletted formats /is/ broken, they could always add
> > > code to disable this bit using the command validator when fixing it.
> > > 
> > > Could we try merging this, and back it out if someone reports a
> > > regression?  I haven't observed any problems.  It's also been quite
> > > stable.
> > 
> > Yeah makes sense. When resending please incorporated review feedback
> > (Ville dug out the wa name), I've done that. And I've pasted the
> > additional detail about the libva saga, just for reference (since no one
> > will remember that it's mplayer's OSD which uses this 2 months down the
> > road).
> > 
> > Also please cc libva mailing lists next time around as an fyi. Done that
> > too.
> > 
> > Queued for -next, thanks for the patch.
> > -Daniel
> 
> Oh, sorry, I missed that in the review.
> 
> Thanks, Daniel!
> 
> --Ken
> _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx


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Re: [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Kenneth Graunke]

[-- Attachment #1.1: Type: text/plain, Size: 896 bytes --]

On Tuesday, January 06, 2015 01:11:53 PM Xiang, Haihao wrote:
> 
> Hi Kenneth,
> 
> How did you test OSD ? I can't reproduce the issue you mentioned, OSD
> works well for me when using mplayer-vaapi with the latest
> libva/libva-intel-driver master branch.
> 
> I tried your patch, what surprised me is OSD still works well after
> applying your patch. It seems your patch didn't disable the palette.
> 
> Thanks
> Haihao

I ran:

mplayer -osdlevel 3 -vo vaapi big_buck_bunny_720p_stereo.ogg

For me, the OSD text is solid green, with hard edges.

If you use "-vo gl" or "-vo xv", the OSD is solid white text with a black
border around it.  I presume that it's supposed to be white with vaapi as
well, but I guess I'm not entirely sure.

It's possible that the optimization doesn't affect the palette as long as
you never use sample_c with the paletted textures.

--Ken

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Re: [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Xiang, Haihao]

On Mon, 2015-01-05 at 21:54 -0800, Kenneth Graunke wrote:
> On Tuesday, January 06, 2015 01:11:53 PM Xiang, Haihao wrote:
> > 
> > Hi Kenneth,
> > 
> > How did you test OSD ? I can't reproduce the issue you mentioned, OSD
> > works well for me when using mplayer-vaapi with the latest
> > libva/libva-intel-driver master branch.
> > 
> > I tried your patch, what surprised me is OSD still works well after
> > applying your patch. It seems your patch didn't disable the palette.
> > 
> > Thanks
> > Haihao
> 
> I ran:
> 
> mplayer -osdlevel 3 -vo vaapi big_buck_bunny_720p_stereo.ogg
> 
> For me, the OSD text is solid green, with hard edges.

The OSD text is white for me when using mplayer -osdlevel 3 -vo vaapi
xxx. If possible, could you update your mplayer ?

> 
> If you use "-vo gl" or "-vo xv", the OSD is solid white text with a black
> border around it.  I presume that it's supposed to be white with vaapi as
> well, but I guess I'm not entirely sure.
> 
> It's possible that the optimization doesn't affect the palette as long as
> you never use sample_c with the paletted textures.


I verified the palette takes effect in the following way:

1. Only support P8A8 format in the driver

2. ran the above command and I saw white OSD text

3. Only support P4A4 format in the driver and don't use
3DSTATE_SAMPLER_PALETTE_LOAD0 to load the value to the texture palette,
so the palette keeps unchanged. 

4. ran the above command and I saw black OSD text.

5. Load the right value to the texture palette and ran the above command
again, I saw white OSD text.

Hence I think sample_c with the paletted textures is used in the driver.


> 
> --Ken


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Re: [Intel-gfx] [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Xiang, Haihao]

On Tue, 2015-01-06 at 14:39 +0800, Xiang, Haihao wrote:
> On Mon, 2015-01-05 at 21:54 -0800, Kenneth Graunke wrote:
> > On Tuesday, January 06, 2015 01:11:53 PM Xiang, Haihao wrote:
> > > 
> > > Hi Kenneth,
> > > 
> > > How did you test OSD ? I can't reproduce the issue you mentioned, OSD
> > > works well for me when using mplayer-vaapi with the latest
> > > libva/libva-intel-driver master branch.
> > > 
> > > I tried your patch, what surprised me is OSD still works well after
> > > applying your patch. It seems your patch didn't disable the palette.
> > > 
> > > Thanks
> > > Haihao
> > 
> > I ran:
> > 
> > mplayer -osdlevel 3 -vo vaapi big_buck_bunny_720p_stereo.ogg
> > 
> > For me, the OSD text is solid green, with hard edges.
> 
> The OSD text is white for me when using mplayer -osdlevel 3 -vo vaapi
> xxx. If possible, could you update your mplayer ?
> 
> > 
> > If you use "-vo gl" or "-vo xv", the OSD is solid white text with a black
> > border around it.  I presume that it's supposed to be white with vaapi as
> > well, but I guess I'm not entirely sure.
> > 
> > It's possible that the optimization doesn't affect the palette as long as
> > you never use sample_c with the paletted textures.
> 
> 
> I verified the palette takes effect in the following way:
> 
> 1. Only support P8A8 format in the driver
> 
> 2. ran the above command and I saw white OSD text
> 
> 3. Only support P4A4 format in the driver and don't use
> 3DSTATE_SAMPLER_PALETTE_LOAD0 to load the value to the texture palette,
> so the palette keeps unchanged. 
> 
> 4. ran the above command and I saw black OSD text.
> 
> 5. Load the right value to the texture palette and ran the above command
> again, I saw white OSD text.
> 
> Hence I think sample_c with the paletted textures is used in the driver.

Sorry, libva driver doesn't use sample_c message, I mean the paletted
texture is used.  However corroding to the doc, Palette is disabled for
fast mode.


> 
> > 
> > --Ken
> 
> 
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Re: [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Kenneth Graunke]

[-- Attachment #1.1: Type: text/plain, Size: 2453 bytes --]

On Tuesday, January 06, 2015 02:39:36 PM Xiang, Haihao wrote:
> On Mon, 2015-01-05 at 21:54 -0800, Kenneth Graunke wrote:
> > On Tuesday, January 06, 2015 01:11:53 PM Xiang, Haihao wrote:
> > > 
> > > Hi Kenneth,
> > > 
> > > How did you test OSD ? I can't reproduce the issue you mentioned, OSD
> > > works well for me when using mplayer-vaapi with the latest
> > > libva/libva-intel-driver master branch.
> > > 
> > > I tried your patch, what surprised me is OSD still works well after
> > > applying your patch. It seems your patch didn't disable the palette.
> > > 
> > > Thanks
> > > Haihao
> > 
> > I ran:
> > 
> > mplayer -osdlevel 3 -vo vaapi big_buck_bunny_720p_stereo.ogg
> > 
> > For me, the OSD text is solid green, with hard edges.
> 
> The OSD text is white for me when using mplayer -osdlevel 3 -vo vaapi
> xxx. If possible, could you update your mplayer ?

Huh.  I'm using the Arch Linux package of mplayer-vaapi 36265-13,
which seems to be the most recent subversion commit ID.  I've never seen
white text on my Haswell system - it seems to be consistently dark green.

> > If you use "-vo gl" or "-vo xv", the OSD is solid white text with a black
> > border around it.  I presume that it's supposed to be white with vaapi as
> > well, but I guess I'm not entirely sure.
> > 
> > It's possible that the optimization doesn't affect the palette as long as
> > you never use sample_c with the paletted textures.
> 
> I verified the palette takes effect in the following way:
> 
> 1. Only support P8A8 format in the driver
> 
> 2. ran the above command and I saw white OSD text
> 
> 3. Only support P4A4 format in the driver and don't use
> 3DSTATE_SAMPLER_PALETTE_LOAD0 to load the value to the texture palette,
> so the palette keeps unchanged. 
> 
> 4. ran the above command and I saw black OSD text.
> 
> 5. Load the right value to the texture palette and ran the above command
> again, I saw white OSD text.
> 
> Hence I think sample_c with the paletted textures is used in the driver.

That sounds like the palette is actually working, then.  Great :)

I doubt that libva would use sample_c - sampling with a shadow comparison?
It looks like it just uses sample and sample+killpix.

I'm pretty sure the sample_c optimization just uses the palette memory as
storage for some stuff, so it's quite possible it just works if you're
only using sample and sample+killpix.

--Ken

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Re: [Intel-gfx] [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Xiang, Haihao]

On Mon, 2015-01-05 at 23:03 -0800, Kenneth Graunke wrote:
> On Tuesday, January 06, 2015 02:39:36 PM Xiang, Haihao wrote:
> > On Mon, 2015-01-05 at 21:54 -0800, Kenneth Graunke wrote:
> > > On Tuesday, January 06, 2015 01:11:53 PM Xiang, Haihao wrote:
> > > > 
> > > > Hi Kenneth,
> > > > 
> > > > How did you test OSD ? I can't reproduce the issue you mentioned, OSD
> > > > works well for me when using mplayer-vaapi with the latest
> > > > libva/libva-intel-driver master branch.
> > > > 
> > > > I tried your patch, what surprised me is OSD still works well after
> > > > applying your patch. It seems your patch didn't disable the palette.
> > > > 
> > > > Thanks
> > > > Haihao
> > > 
> > > I ran:
> > > 
> > > mplayer -osdlevel 3 -vo vaapi big_buck_bunny_720p_stereo.ogg
> > > 
> > > For me, the OSD text is solid green, with hard edges.
> > 
> > The OSD text is white for me when using mplayer -osdlevel 3 -vo vaapi
> > xxx. If possible, could you update your mplayer ?
> 
> Huh.  I'm using the Arch Linux package of mplayer-vaapi 36265-13,
> which seems to be the most recent subversion commit ID.  I've never seen
> white text on my Haswell system - it seems to be consistently dark green.

> > > If you use "-vo gl" or "-vo xv", the OSD is solid white text with a black
> > > border around it.  I presume that it's supposed to be white with vaapi as
> > > well, but I guess I'm not entirely sure.
> > > 
> > > It's possible that the optimization doesn't affect the palette as long as
> > > you never use sample_c with the paletted textures.
> > 
> > I verified the palette takes effect in the following way:
> > 
> > 1. Only support P8A8 format in the driver
> > 
> > 2. ran the above command and I saw white OSD text
> > 
> > 3. Only support P4A4 format in the driver and don't use
> > 3DSTATE_SAMPLER_PALETTE_LOAD0 to load the value to the texture palette,
> > so the palette keeps unchanged. 
> > 
> > 4. ran the above command and I saw black OSD text.
> > 
> > 5. Load the right value to the texture palette and ran the above command
> > again, I saw white OSD text.
> > 
> > Hence I think sample_c with the paletted textures is used in the driver.
> 
> That sounds like the palette is actually working, then.  Great :)
> 
> I doubt that libva would use sample_c - sampling with a shadow comparison?
> It looks like it just uses sample and sample+killpix.

You are right, libva driver doesn't use sample_c message. 

> I'm pretty sure the sample_c optimization just uses the palette memory as
> storage for some stuff, so it's quite possible it just works if you're
> only using sample and sample+killpix.

Thanks for the explanation, it makes sense to me.

> 
> --Ken


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Re: [Intel-gfx] [PATCH] drm/i915: Make sample_c messages go faster on Haswell.

[Daniel Vetter]

On Tue, Jan 06, 2015 at 03:15:39PM +0800, Xiang, Haihao wrote:
> On Mon, 2015-01-05 at 23:03 -0800, Kenneth Graunke wrote:
> > On Tuesday, January 06, 2015 02:39:36 PM Xiang, Haihao wrote:
> > > On Mon, 2015-01-05 at 21:54 -0800, Kenneth Graunke wrote:
> > > > On Tuesday, January 06, 2015 01:11:53 PM Xiang, Haihao wrote:
> > > > > 
> > > > > Hi Kenneth,
> > > > > 
> > > > > How did you test OSD ? I can't reproduce the issue you mentioned, OSD
> > > > > works well for me when using mplayer-vaapi with the latest
> > > > > libva/libva-intel-driver master branch.
> > > > > 
> > > > > I tried your patch, what surprised me is OSD still works well after
> > > > > applying your patch. It seems your patch didn't disable the palette.
> > > > > 
> > > > > Thanks
> > > > > Haihao
> > > > 
> > > > I ran:
> > > > 
> > > > mplayer -osdlevel 3 -vo vaapi big_buck_bunny_720p_stereo.ogg
> > > > 
> > > > For me, the OSD text is solid green, with hard edges.
> > > 
> > > The OSD text is white for me when using mplayer -osdlevel 3 -vo vaapi
> > > xxx. If possible, could you update your mplayer ?
> > 
> > Huh.  I'm using the Arch Linux package of mplayer-vaapi 36265-13,
> > which seems to be the most recent subversion commit ID.  I've never seen
> > white text on my Haswell system - it seems to be consistently dark green.
> 
> > > > If you use "-vo gl" or "-vo xv", the OSD is solid white text with a black
> > > > border around it.  I presume that it's supposed to be white with vaapi as
> > > > well, but I guess I'm not entirely sure.
> > > > 
> > > > It's possible that the optimization doesn't affect the palette as long as
> > > > you never use sample_c with the paletted textures.
> > > 
> > > I verified the palette takes effect in the following way:
> > > 
> > > 1. Only support P8A8 format in the driver
> > > 
> > > 2. ran the above command and I saw white OSD text
> > > 
> > > 3. Only support P4A4 format in the driver and don't use
> > > 3DSTATE_SAMPLER_PALETTE_LOAD0 to load the value to the texture palette,
> > > so the palette keeps unchanged. 
> > > 
> > > 4. ran the above command and I saw black OSD text.
> > > 
> > > 5. Load the right value to the texture palette and ran the above command
> > > again, I saw white OSD text.
> > > 
> > > Hence I think sample_c with the paletted textures is used in the driver.
> > 
> > That sounds like the palette is actually working, then.  Great :)
> > 
> > I doubt that libva would use sample_c - sampling with a shadow comparison?
> > It looks like it just uses sample and sample+killpix.
> 
> You are right, libva driver doesn't use sample_c message. 
> 
> > I'm pretty sure the sample_c optimization just uses the palette memory as
> > storage for some stuff, so it's quite possible it just works if you're
> > only using sample and sample+killpix.
> 
> Thanks for the explanation, it makes sense to me.

Thanks for digging into this some more, I've added the above discussion in
a quote to the commit message.

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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