linux-kernel - Intel graphics CPU usage

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Message-ID: <AANLkTi=NFpeyo7Q31yMfqKSP2c-2OS2ccqa=Q9CQ8bpk@mail.gmail.com>
Date:	Sun, 15 Aug 2010 19:32:15 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Airlie <airlied@...ux.ie>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Zhao Yakui <yakui.zhao@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Adam Jackson <ajax@...hat.com>
Cc:	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	linux-kernel@...r.kernel.org
Subject: Intel graphics CPU usage - SDVO detect bogosity?

I started wondering why 'top' was showing an otherwise idle system as
having a load average of 0.5+, and worker threads constantly using the
CPU.

So I did a system-wide profile, and got the attached output (look at
it in a really wide terminal).

There seems to be something _seriously_ wrong with i915 SDVO detect.
This is on an Apple Mac Mini (hey, your favorite problem child!), and
apparently it spends 20% of its non-idle CPU time just doing udelay's
for the i2c SDVO connection detection.

That sounds a bit wrong, doesn't it?

I don't know how recent this is - it might have been going on for some
time without me noticing. It's the wife's computer, and the same thing
doesn't seem to happen on my Core i5 desktop

Any ideas? Any information I can give about the machine?

                        Linus

View attachment "system-profile.txt" of type "text/plain" (113776 bytes)