Bug 91801

Summary:	[amd][tahiti xt] severe performance loss
Product:	DRI	Reporter:	Sylvain BERTRAND <sylvain.bertrand>
Component:	DRM/Radeon	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED NOTOURBUG	QA Contact:
Severity:	normal
Priority:	medium
Version:	DRI git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Sylvain BERTRAND 2015-08-29 19:29:23 UTC

With the same user space (mesa/libdrm...), I went from agd5f linux (drm-fixes-4.1 ee18e599251ed06bf0c8ade7c434a0de311342ca)
to an official linux 4.2-rc8.
All 3D games suffer from a severe performance loss.

Comment 1 Sylvain BERTRAND 2015-08-29 20:05:32 UTC

I tried with latest agd5f drm-next-4.3 (c2b6bd7e91aad8440a2f55bdbde6f5a8ae19fac5)
The performance loss is the same than with the official 4.2-rc8.

Comment 2 Sylvain BERTRAND 2015-08-30 20:28:21 UTC

bisected: commit 8cb9764fc88b41db11f251e8b2a0d006578b7eb4
Not a driver bug, linux core scheduler code seems screwed for my full dyntick
systems :(((((

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