Bug 93865

Summary:	debugfs: expose fifo pipe underrun counts
Product:	DRI	Reporter:	Joe Konno <joe.konno>
Component:	DRM/Intel	Assignee:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Status:	CLOSED NOTABUG	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	major
Priority:	medium	CC:	intel-gfx-bugs, rodrigo.vivi
Version:	DRI git
Hardware:	All
OS:	Linux (All)
URL:	http://patchwork.freedesktop.org/series/2852/
Whiteboard:
i915 platform:	ALL	i915 features:	display/Other

Description Joe Konno 2016-01-25 21:52:27 UTC

I believe a mechanism for counting pipe [under,over]runs would be useful during debug.

If, during a particular workload, you consistently see X pipe underruns, and then apply a patch and see "10% less" pipe underruns, you can say you've progressed or regressed.

Propose adding a quick counter every vsync. I'll post an RFC patch today or tomorrow.

Comment 1 Joe Konno 2016-01-26 19:42:19 UTC

Sent RFC to mailing list:
  * http://patchwork.freedesktop.org/series/2852/

Comment 2 Jani Saarinen 2016-12-09 11:13:04 UTC

Joe, is this issue still valid?

Comment 3 Jani Saarinen 2017-03-08 07:28:34 UTC

Closing as no response. Joe if your patch is not in and you are not happy, please re-open.

Comment 4 Joe Konno 2017-03-08 14:56:09 UTC

My original RFC was overly simplistic when I submitted it. And given how much development has happened over the last year, it would likely need a complete re-think and re-vamp.

There is a need for accurate underrun accounting for debug, though I haven't the bandwidth to meet that need.

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