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

[bugzilla-daemon at bugzilla.kernel.org]

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

--- Comment #15 from Barto (mister.freeman at 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 at 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 at 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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