Bug 30025

Summary:	r600 kms, massave slowdown with latest drm-radeon-testing
Product:	DRI	Reporter:	aaron <chainsawbike>
Component:	DRM/Radeon	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED DUPLICATE	QA Contact:
Severity:	normal
Priority:	medium
Version:	XOrg git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description aaron 2010-09-05 02:56:33 UTC

ive bisected to this commit:
http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commitdiff;h=8b8d01dff630e9725828689d001ec9bc5baba0b7

odd thing i noted:
if i run compiz with vblank_mode=0 and run glxgears  it reports a frame-rate of about 1500 fps ( being the same as i get when running the previous revision kernel) but its still looks as slow as molasses
if i unset vblank_mode then run it it reports about 5 fps but looks the same as before

Comment 1 Tobias Jakobi 2010-09-05 04:06:47 UTC

I think this one is well knows, have you tried disabling writeback with no_wb=1 as radeon module parameter?

Also note that gears is _not_ a benchmark.

Comment 2 aaron 2010-09-05 05:05:55 UTC

yep passing radeon.no_wb=1 to the kernel fixes it

@glxgears i kinda expected that but i don't think im using it for one...
im just trying to show the difference between reported and apparent frame-rate in certain situations - it just seems odd...

Comment 3 Andy Furniss 2010-09-05 05:33:47 UTC

More info + patch in

https://bugs.freedesktop.org/show_bug.cgi?id=29972

*** This bug has been marked as a duplicate of bug 29972 ***

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