[Bug 198511] New: lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[Bug 198511] New: lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

            Bug ID: 198511
           Summary: lags in youtube videos 1080p 60fps with radeon hd4650
                    and kernel 4.15rc8
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.15rc8 mainline
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: mister.freeman@laposte.net
        Regression: No

Hello,

I have a radeon HD4650 pcie, I use the radeon driver,

I notice that with kernel 4.15.rc8 mainline some videos in 1080p@60fps format
in youtube play with slight lags in fullscreen mode,

but If use kernel 4.14.13-1 then all is Ok, streaming videos in 1080p@60fps
play without lags ( perfect 60 fps ),

so I suspect a bug in radeon driver provided by kernel 4.15.rc8,

my OS is archlinux 64 bits,

some example of video 1080@60 fps for youtube :
https://www.youtube.com/watch?v=CcUXxM_rbAM

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #1 from Barto (mister.freeman@laposte.net) ---
Created attachment 273695
  --> https://bugzilla.kernel.org/attachment.cgi?id=273695&action=edit
glxinfo

glxinfo

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #2 from Barto (mister.freeman@laposte.net) ---
Created attachment 273697
  --> https://bugzilla.kernel.org/attachment.cgi?id=273697&action=edit
dmesg kernel 4.14.13 good

dmesg kernel 4.14.13

with this version there is no problem of lags in youtube 1080p@60 fps in
fullscreen

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #3 from Alex Deucher (alexdeucher@gmail.com) ---
Can you bisect?

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #4 from Barto (mister.freeman@laposte.net) ---
I will try(In reply to Alex Deucher from comment #3)
> Can you bisect?

I will try to bisect

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #5 from Barto (mister.freeman@laposte.net) ---
I did the bisect,

the first bad commit is :

commit cf2623d951c1c52923a776e01cf2e2afc9d042a0
Author: Rex Zhu <Rex.Zhu@amd.com>
Date:   Mon Sep 4 18:11:52 2017 +0800

    drm/amd/powerplay: refine powerplay code for RV

    use function points instand of function table.

    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #6 from Barto (mister.freeman@laposte.net) ---
Created attachment 273743
  --> https://bugzilla.kernel.org/attachment.cgi?id=273743&action=edit
bisect log

here is the bisect log

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #7 from Alex Deucher (alexdeucher@gmail.com) ---
I think something went wrong with your bisect.  That commit touched a
completely different driver that's not even loaded on your system.

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #8 from Barto (mister.freeman@laposte.net) ---
Yes you (In reply to Alex Deucher from comment #7)
> I think something went wrong with your bisect.  That commit touched a
> completely different driver that's not even loaded on your system.

yes you are right, something went wrong with the bisect,

because I revet commit cf2623d9 then the bug is still here

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #9 from Barto (mister.freeman@laposte.net) ---
(In reply to Barto from comment #8)
> yes you are right, something went wrong with the bisect,
> 
> because I revet commit cf2623d9 then the bug is still here

I meant "if I revert commit cf2623d9 then the bug is still here"

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #10 from Barto (mister.freeman@laposte.net) ---
I think I found the real "first bad commit",

it's :

commit 648bc3574716400acc06f99915815f80d9563783
Author: Christian König <christian.koenig@amd.com>
Date:   Thu Jul 6 09:59:43 2017 +0200

    drm/ttm: add transparent huge page support for DMA allocations v2

    Try to allocate huge pages when it makes sense.

    v2: fix comment and use ifdef

    Signed-off-by: Christian König <christian.koenig@amd.com>
    Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

because the previous commit( d188bfa5532ce5b426681d8530ff1a9683eea0ad ) before
this bad commit doesn't have the bug, so I can conclude that the first bad
commit which introduces the bug is 648bc3574716400acc06f99915815f80d9563783,

I have made a new bisect which confirms the same thing,

so what do you think Alex ?
I tried to revert 648bc3574716400acc06f99915815f80d9563783 but git refuses to
revert this commit because of conflict file, it seems that later one developper
has edited one or several files modified previoulsy by commit
648bc3574716400acc06f99915815f80d9563783

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

Barto (mister.freeman@laposte.net) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #273743|0                           |1
        is obsolete|                            |

--- Comment #11 from Barto (mister.freeman@laposte.net) ---
Created attachment 273747
  --> https://bugzilla.kernel.org/attachment.cgi?id=273747&action=edit
new git bisect log

here is a new bisect log, which confirms that commit
648bc3574716400acc06f99915815f80d9563783 is the first bad commit

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #12 from Barto (mister.freeman@laposte.net) ---
Created attachment 273757
  --> https://bugzilla.kernel.org/attachment.cgi?id=273757&action=edit
workaround by reverting changes made by the bad commit

I created a patch, it's a workaround very simple, 

it reverts changes made by commit 648bc3574716400acc06f99915815f80d9563783
related to drm/ttm and radeon_ttm.c,

the idea is to restore the same behaviour of kernel 4.14.13 for drm/ttm, 

8 files patched :

drivers/gpu/drm/ttm/ttm_bo_util.c
drivers/gpu/drm/ttm/ttm_memory.c
drivers/gpu/drm/ttm/ttm_page_alloc.c
drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
drivers/gpu/drm/radeon/radeon_ttm.c
include/drm/ttm/ttm_debug.h
include/drm/ttm/ttm_memory.h
include/drm/ttm/ttm_page_alloc.h

I hope a definitive solution will be found by Alex or Christian König

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #13 from Barto (mister.freeman@laposte.net) ---
the specs of my PC :

cpu : intel core 2 quad Q9650 ( 3 Ghz )
ram : 8 Gb DDR2
gpu : amd radeon HD4650 pcie
motherboard : gigabyte GA-P35-DS3L ( socket 775, chipset intel P35 )
window manager : plasma 5 ( kde )
OS : archlinux 64 bits
web browser : firefox 57.0.4 ( youtube in html5 mode, no flash plugin )


the output of "cat /proc/meminfo" when the bug occurs :

MemTotal:        8171844 kB
MemFree:         6188792 kB
MemAvailable:    6979356 kB
Buffers:          156940 kB
Cached:           780372 kB
SwapCached:            0 kB
Active:          1020160 kB
Inactive:         742148 kB
Active(anon):     647812 kB
Inactive(anon):   126472 kB
Active(file):     372348 kB
Inactive(file):   615676 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       5242876 kB
SwapFree:        5242876 kB
Dirty:             21768 kB
Writeback:             0 kB
AnonPages:        812840 kB
Mapped:           423408 kB
Shmem:            127600 kB
Slab:              73336 kB
SReclaimable:      46020 kB
SUnreclaim:        27316 kB
KernelStack:        6256 kB
PageTables:        29324 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     9328796 kB
Committed_AS:    2785064 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:    145408 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      187264 kB
DirectMap2M:     8200192 kB

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

Christian König (christian.koenig@amd.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |christian.koenig@amd.com

--- Comment #14 from Christian König (christian.koenig@amd.com) ---
Well it is expected that this patch causes slightly more overhead during memory
allocation in exchange for better throughput.

But that should never result in lags in youtube videos, at least not of the
browser doesn't do something very very stupid.

(In reply to Barto from comment #13)
> HugePages_Total:       0
> HugePages_Free:        0
> HugePages_Rsvd:        0
> HugePages_Surp:        0
> Hugepagesize:       2048 kB

Ok well that is strange, the patch shouldn't have any effect when huge pages
are disabled.

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #15 from Barto (mister.freeman@laposte.net) ---
Hello Christian,

I tried to disable "transparent huge page" with the kernel parameter
"transparent_hugepage=never", but the bug is still here

here is the output of "cat /proc/meminfo" when the kernel parameter
"transparent_hugepage=never" is used and when I see hd youtube video@60 fps in
fullscreen mode :

MemTotal:        8171844 kB
MemFree:         6201872 kB
MemAvailable:    7196352 kB
Buffers:          175860 kB
Cached:           828424 kB
SwapCached:            0 kB
Active:           962712 kB
Inactive:         770948 kB
Active(anon):     572560 kB
Inactive(anon):   117736 kB
Active(file):     390152 kB
Inactive(file):   653212 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       5242876 kB
SwapFree:        5242876 kB
Dirty:              6592 kB
Writeback:             0 kB
AnonPages:        729364 kB
Mapped:           446376 kB
Shmem:            118880 kB
Slab:              80408 kB
SReclaimable:      52736 kB
SUnreclaim:        27672 kB
KernelStack:        5956 kB
PageTables:        31036 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     9328796 kB
Committed_AS:    2722200 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      201600 kB
DirectMap2M:     8185856 kB

the same experience but without the kernel parameter
"transparent_hugepage=never", the bug is still here :

MemTotal:        8171844 kB
MemFree:         6068060 kB
MemAvailable:    6948308 kB
Buffers:          181860 kB
Cached:           851652 kB
SwapCached:            0 kB
Active:          1107604 kB
Inactive:         752108 kB
Active(anon):     663292 kB
Inactive(anon):   123784 kB
Active(file):     444312 kB
Inactive(file):   628324 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       5242876 kB
SwapFree:        5242876 kB
Dirty:             11148 kB
Writeback:             0 kB
AnonPages:        814052 kB
Mapped:           457708 kB
Shmem:            124920 kB
Slab:              84420 kB
SReclaimable:      56168 kB
SUnreclaim:        28252 kB
KernelStack:        5936 kB
PageTables:        31100 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     9328796 kB
Committed_AS:    2813580 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:    161792 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      199552 kB
DirectMap2M:     8187904 kB

what it's sure is that the commit 648bc357471 "drm/ttm: add transparent huge
page support for DMA allocations v2" triggers the bug with my PC configuration,
when I want to see a youtube video 1080p@60fps in fullscreen mode, there is a
performance issue, the playback is not 100% fluid ( I can notice little lags in
travelling-type images )

some additionnal informations :

- I use plasma 5 ( kde ) as window manager, the vsync option is set to
"automatic" in plasma 5 options, "openGL 2.0 acceleration" option is used for
the compositor for plasma 5,

- mesa version : 17.3.2-2
$ glxinfo | grep "OpenGL version"                                               
OpenGL version string: 3.0 Mesa 17.3.2          

- the contain of /etc/X11/xorg.conf.d/20-radeon.conf :

Section "Device"
    Identifier "Radeon"
    Driver "modesetting"
    Option "TearFree" "off"
    Option "DRI" "3"
    Option "AccelMethod" "glamor"
EndSection

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #16 from Christian König (christian.koenig@amd.com) ---
(In reply to Barto from comment #15)
> Hello Christian,
> 
> I tried to disable "transparent huge page" with the kernel parameter
> "transparent_hugepage=never", but the bug is still here

Sounds like you misunderstood me:
> HugePages_Total:       0
> HugePages_Free:        0
> HugePages_Rsvd:        0
> HugePages_Surp:        0
> Hugepagesize:       2048 kB

Huge pages are always disabled on your system. It would be interesting to see
what happens when you try to enable them, not disable them.

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #17 from Christian König (christian.koenig@amd.com) ---
What is the content of /sys/kernel/debug/dri/0/ttm_dma_page_pool while you are
playing a youtube video?

And can you try to compile the kernel with CONFIG_SWIOTLB disabled?

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #18 from Barto (mister.freeman@laposte.net) ---
here is the output of "cat /sys/kernel/debug/dri/0/ttm_dma_page_pool" with
kernel 4.15rc8 when I play a youtube video hd@60 fps in full screen mode :


         pool      refills   pages freed    inuse available     name
           wc          801             0     2834      370 radeon 0000:01:00.0
       wchuge         1079          4307        6        3 radeon 0000:01:00.0
       cached        10663         42097      552        3 radeon 0000:01:00.0
   cachedhuge            6            19        0        5 radeon 0000:01:00.0

I will try to compile kernel 4.15rc8 with CONFIG_SWIOTLB disabled

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #19 from Barto (mister.freeman@laposte.net) ---
(In reply to Christian König from comment #16)

> Huge pages are always disabled on your system. It would be interesting to
> see what happens when you try to enable them, not disable them.

I tried with kernel parameter "transparent_hugepage=always", the bug is still
here, and here is the output of ""cat /proc/meminfo", it seems that huge pages
are still not used by my system despite the kernel parameter :


MemTotal:        8171844 kB
MemFree:         6052052 kB
MemAvailable:    6938968 kB
Buffers:          179304 kB
Cached:           854248 kB
SwapCached:            0 kB
Active:          1076432 kB
Inactive:         803524 kB
Active(anon):     676640 kB
Inactive(anon):   122984 kB
Active(file):     399792 kB
Inactive(file):   680540 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       5242876 kB
SwapFree:        5242876 kB
Dirty:              3016 kB
Writeback:             0 kB
AnonPages:        828348 kB
Mapped:           447036 kB
Shmem:            124128 kB
Slab:              82000 kB
SReclaimable:      53952 kB
SUnreclaim:        28048 kB
KernelStack:        6368 kB
PageTables:        32316 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     9328796 kB
Committed_AS:    2841448 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:    106496 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      205696 kB
DirectMap2M:     8181760 kB

but what means the line "AnonHugePages" ?

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #20 from Christian König (christian.koenig@amd.com) ---
(In reply to Barto from comment #19)
> AnonHugePages:    106496 kB
> ShmemHugePages:        0 kB
...
> but what means the line "AnonHugePages" ?

Ah crap you are right, AnonHugePages are the anonymous huge pages. I was
looking at the wrong value.

So huge page support is indeed enabled on you CPU, and it doesn't seem to
matter if we enable or disable it.

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #21 from Christian König (christian.koenig@amd.com) ---
(In reply to Barto from comment #18)
>          pool      refills   pages freed    inuse available     name
>            wc          801             0     2834      370 radeon
> 0000:01:00.0
>        wchuge         1079          4307        6        3 radeon
> 0000:01:00.0
>        cached        10663         42097      552        3 radeon
> 0000:01:00.0
>    cachedhuge            6            19        0        5 radeon
> 0000:01:00.0
> 
> I will try to compile kernel 4.15rc8 with CONFIG_SWIOTLB disabled

Can you also give me those numbers before, while and after you played a video
on youtube? Especially what are the number of refills and pages freed before,
while and after you play the video?

It starts to look more like that this isn't an issue in the kernel, but rather
the userspace stack or application is constantly allocating and freeing memory.

Best approach would be to gather the "while you play the video" numbers from a
separate system over ssh, because when you put the firefox window into the
background it can change the results.

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #22 from Barto (mister.freeman@laposte.net) ---
(In reply to Christian König from comment #21)

> Best approach would be to gather the "while you play the video" numbers from
> a separate system over ssh, because when you put the firefox window into the
> background it can change the results.

I have already use a special technic in order to be able to get the infos while
playing a video, I use a bash script with an "infinite while loop", which can
allow me to put in fullscreen mode the video while the script will generate the
log files :

#!/bin/bash

i="0"
j="0"

while [ $i -lt 4 ]
do
sleep 1
echo $j
cat /proc/meminfo > log_$j.txt
j=$[$j+1]
done

I tried to rebuild kernel 4.15rc8 with the option "CONFIG_SWIOTLB" disabled,
the bug is still here

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #23 from Barto (mister.freeman@laposte.net) ---
so here is the output of "cat /sys/kernel/debug/dri/0/ttm_dma_page_pool" when
no youtube video are played ( firefox is not running ), with kernel 4.15rc8 :


         pool      refills   pages freed    inuse available     name
           wc         1682             0     1344     5384 radeon 0000:01:00.0
       wchuge         1130          4514        0        6 radeon 0000:01:00.0
       cached       106272        424533      552        3 radeon 0000:01:00.0
   cachedhuge            6            18        0        6 radeon 0000:01:00.0

and now with firefox running, youtube video hd@60 fps in full screen mode (
output given by my bash script running in background ) :

         pool      refills   pages freed    inuse available     name
           wc         1682             0     2089     4639 radeon 0000:01:00.0
       wchuge         3012         12042        3        3 radeon 0000:01:00.0
       cached       113562        453693      552        3 radeon 0000:01:00.0
   cachedhuge            7            24        0        4 radeon 0000:01:00.0


I made another expirement : using a different web-browser :

- If I use chromium 63.0.3239.132 ( a web browser based on chrome ) then there
is no bug, playback is 100% fluid, no lags, it's perfect,

- If I use opera 50.0 then there is a bug, like firefox 57, I get lags, the
only difference is that I get a vsync problem ( tearing ) 

so it seems that your commit breaks something on applications like web-browsers
if they use a precise technic for rendering streaming video ( related to memory
management ? ), 

chromium seems to be the only web-browser which is not affected by your commit

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #24 from Barto (mister.freeman@laposte.net) ---
I forgot the third case, here is the output after a youtube video has been
played on firefox 57, I closed firefox and now here is the output :

# cat /sys/kernel/debug/dri/0/ttm_dma_page_pool
         pool      refills   pages freed    inuse available     name
           wc         1682             0     4016     2712 radeon 0000:01:00.0
       wchuge         3403         13608        0        4 radeon 0000:01:00.0
       cached       131859        526872      560        4 radeon 0000:01:00.0
   cachedhuge            9            32        0        4 radeon 0000:01:00.0

the numbers seems stable

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #25 from Barto (mister.freeman@laposte.net) ---
Someone has made a suggestion to me : go to "about:support" in firefox for
ckecking some options, I can read this :

HW_COMPOSITING  blocked by default: Acceleration blocked by platform

OPENGL_COMPOSITING      unavailable by default: Hardware compositing is
disabled

WEBRENDER       opt-in by default: WebRender is an opt-in feature
unavailable by runtime: Build doesn't include WebRender

and this guy told me to check if the property
"layers.acceleration.force-enabled" is set to true in firefox ( in
"about:config" section ),

I checked and it was set to false by default, so I set it to true and I
restarted firefox,

and now there is no lag in firefox for youtube video 1080p@60 fps with kernel
4.15rc8

but this advice seems to be a "cheat mode/workaround", it doesn't explain why
your commit triggers this problem with firefox 57 when
"layers.acceleration.force-enabled" option is disabled in firefox ( which is
the default value ),

with kernel 4.14.14 ( and when I revert your commit ) youtube video plays
without lags, even if "layers.acceleration.force-enabled" is disabled

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #26 from Christian König (christian.koenig@amd.com) ---
(In reply to Barto from comment #25)
> but this advice seems to be a "cheat mode/workaround", it doesn't explain
> why your commit triggers this problem with firefox 57 when
> "layers.acceleration.force-enabled" option is disabled in firefox ( which is
> the default value ),

Well, actually it explains perfectly what is going wrong here :)

My huge page patches makes memory accesses faster for the price of making
allocating memory more costly. E.g. by using 2M pages instead of 4K you improve
some hardware path by the factor of 512.

Now what I see when I look at your numbers is that user space allocated and
freed (13608−4514)*2M = 18.1GB of memory while playing youtube videos!.

This means that either the application or the driver stack is doing something
very very stupid. Instead of using buffers round robin they are allocating
them, using them once and then freeing them again.

As a band aid I will try to fix our algorithm when pages are freed again, but
in general the driver stack or application should be fixed to not do that.

Probably best if you open up a bug report on http://bugs.freedesktop.org/ so
that somebody can investigate what userspace is doing here.

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #27 from Barto (mister.freeman@laposte.net) ---
(In reply to Christian König from comment #26)

> Now what I see when I look at your numbers is that user space allocated and
> freed (13608−4514)*2M = 18.1GB of memory while playing youtube videos!.
> 
> This means that either the application or the driver stack is doing
> something very very stupid. Instead of using buffers round robin they are
> allocating them, using them once and then freeing them again.
> 

I made a new test, in order to be sure that there is no mistake ( I disabled
the option ""layers.acceleration.force-enabled" in firefox,

before playing the video :

         pool      refills   pages freed    inuse available     name
           wc          697             0     1344     1444 radeon 0000:01:00.0
       wchuge           26            98        0        6 radeon 0000:01:00.0
       cached         4166         15978      680        6 radeon 0000:01:00.0
   cachedhuge            3             9        0        3 radeon 0000:01:00.0
[root@ultima-dbr cesar]# 


while reading the video ( position 32 seconds ) :

         pool      refills   pages freed    inuse available     name
           wc          783             0     2089     1043 radeon 0000:01:00.0
       wchuge          989          3947        3        6 radeon 0000:01:00.0
       cached         8573         33737      552        3 radeon 0000:01:00.0
   cachedhuge            5            14        0        6 radeon 0000:01:00.0

after reading 38 seconds of the video ( I click to "pause" in youtube at 38
seconds ) :

         pool      refills   pages freed    inuse available     name
           wc          783             0     2285      847 radeon 0000:01:00.0
       wchuge         1153          4607        2        3 radeon 0000:01:00.0
       cached         8675         34143      552        5 radeon 0000:01:00.0
   cachedhuge            5            14        0        6 radeon 0000:01:00.0

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #28 from Barto (mister.freeman@laposte.net) ---
I made another test, by using a player like VLC and a video file ( 1080p, 60
FPS ) :

- with a video file 1080p@60 fps, GPU acceleration disabled ( XV output ) and
kernel 4.15rc8 : I can notice a slight degradation, but less visible than
firefox, it needs a trained eye in order to notice the performance issue,

- with a video file 1080p@60 fps, GPU acceleration enabled ( VDPAU ) and kernel
4.15rc8 : all is ok, perfect 60 FPS frame, 100% smooth playback

- with a video file 1080p@60 fps, GPU acceleration disabled ( XV output ) and
kernel 4.14.14: all is ok

the key here is the video resolution and framerate, things get difficult for my
CPU when we reach the resolution 1080p AND the framerate 60 fps, any weak/non
optimized algorithm in kernel ( or video driver ) will likely trigger slight
lags/frame drops,

if I use the "cheat mode" ( GPU acceleration with VDPAU ) then all is ok, no
lags when the video has a resolution 1080p/60 fps and when I use kernel
4.15rc8.

It would be interesting to create a benchmark ( a simple source code in C ) in
order to evaluate with precision ( with a number ) the performance level of
your algorithm related to drm/ttm, it will make easy the comparison between
kernel 4.14.14 ( old algorithm ) and kernel 4.15rc8

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #29 from Christian König (christian.koenig@amd.com) ---
For this you need to call the driver IOCTL to create a buffer object directly.

Best is probably you use the Mesa code as and work from that backward, see here
https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
function radeon_create_bo.

drmCommandWriteRead(), struct drm_radeon_gem_create and all the defines you
need are provided by libdrm.

Domain should be RADEON_DOMAIN_GTT in this case, flags can be zero or
RADEON_GEM_GTT_WC.

Size and alignment should be obvious.

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[Bug 198511] lags in youtube videos 1080p 60fps with radeon hd4650 and kernel 4.15rc8

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198511

--- Comment #30 from Barto (mister.freeman@laposte.net) ---
(In reply to Christian König from comment #26)
> As a band aid I will try to fix our algorithm when pages are freed again,
> but in general the driver stack or application should be fixed to not do
> that.
> 
> Probably best if you open up a bug report on http://bugs.freedesktop.org/ so
> that somebody can investigate what userspace is doing here.

Did you progress about this ttm algorithm ?

I filmed my screen with a smartphone in order to capture the problem :

https://www.youtube.com/watch?v=YqtleU5YBlA

at first I filmed with kernel 4.14.14, then with kernel 4.15.2, we can see on
the second attempt that the vertical scrool of the credits are not as good as
with kernel 4.14.14

configuration :

configuration used :
- radeon hd4650 pci-e
- CPU intel core 2 quad Q9650
- archlinux 64 bits
- kernel 4.14.14 and 4.15.2-2
- firefox

the youtube video for the test :
https://youtu.be/AXL4r30VgSE?t=19m2s

in fact the performance loss can occur at 720p@30fps on some situation, for
example the vertical scroll of the credits, there are noticeable lags for the
scrolling of the credits, though the rest of the video seems smooth,

it would be interesting to have a kernel boot parameter in order to restore the
previous ttm algorithm

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