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

it's :

commit 648bc3574716400acc06f99915815f80d9563783
Author: Christian König <christian.koenig at 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 at amd.com>
    Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at 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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