[Bug 178221] radeon performance drop from 4.8 to 4.9-rc1 in Shadow of Mordor

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=178221

Alex Deucher <alexdeucher at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |alexdeucher at gmail.com

--- Comment #1 from Alex Deucher <alexdeucher at gmail.com> ---
This was bisected to"

87744ab3832b83ba71b931f86f9cfdb000d07da5 is the first bad commit
commit 87744ab3832b83ba71b931f86f9cfdb000d07da5
Author: Dan Williams <dan.j.williams at intel.com>
Date:   Fri Oct 7 17:00:18 2016 -0700

    mm: fix cache mode tracking in vm_insert_mixed()

    vm_insert_mixed() unlike vm_insert_pfn_prot() and vmf_insert_pfn_pmd(),
    fails to check the pgprot_t it uses for the mapping against the one
    recorded in the memtype tracking tree.  Add the missing call to
    track_pfn_insert() to preclude cases where incompatible aliased mappings
    are established for a given physical address range.

    Link: http://lkml.kernel.org/r/
147328717909.35069.14256589123570653697.stgit at dwillia2-
desk3.amr.corp.intel.com
    Signed-off-by: Dan Williams <dan.j.williams at intel.com>
    Cc: David Airlie <airlied at linux.ie>
    Cc: Matthew Wilcox <mawilcox at microsoft.com>
    Cc: Ross Zwisler <ross.zwisler at linux.intel.com>
    Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>

Does reverting that commit fix your issue?

See:
https://lists.freedesktop.org/archives/dri-devel/2016-October/120693.html

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