Bug 14311

Summary:	[intel] Poor XvMC performance
Product:	xorg	Reporter:	Randolph Chung <tausq>
Component:	Driver/intel	Assignee:	Wang Zhenyu <zhenyu.z.wang>
Status:	RESOLVED WONTFIX	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium	CC:	mozilla_bugs
Version:	git
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Randolph Chung 2008-01-30 21:25:24 UTC

Using 2.2.0 driver + xorg 1.4.99.2 from GIT today, XvMC is enabled according to
Xorg.0.log. Using xine, I see something like:
[intel_xvmc] info: decoder type is i915/945 MPEG2 MC decoder

so it looks like it's getting the right interface

However, I don't seem to notice any performance improvements. CPU usage
for playing various MPEG video clips is similar between xvmc and just
xv.

According to http://lists.freedesktop.org/archives/xorg/2008-January/032528.html this is a driver optimization issue. Filing a bug to track it.

thanks
randolph

Comment 1 Wang Zhenyu 2008-06-27 20:28:49 UTC

I've pushed several patches in master which really restore current i915 xvmc performance identical or a little better than xv (showed with profile). There'll still be large space to increase xvmc performance to go with gem, that's my next step I think.

Comment 2 Michael Fu 2008-11-25 20:46:50 UTC

We will not put further effort on XvMC for 915/945 platform.

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