From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yves-Alexis Perez Subject: Re: [Bug #12152] Huge wakeups number from i1915 Date: Mon, 08 Dec 2008 07:32:49 +0100 Message-ID: <1228717969.9677.9.camel@hidalgo> References: <6VnlupFpCsN.A.2rE.MsEPJB@chimera> <07Xes05z25M.A.VtF.ksEPJB@chimera> <20081207145203.0f998d5b@infradead.org> <200812072352.07151.rjw@sisk.pl> <20081207151203.46c01a0d@infradead.org> <1228717448.9677.3.camel@hidalgo> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-N7OvyR/HkP2IoUFv5dAc" Return-path: In-Reply-To: <1228717448.9677.3.camel@hidalgo> Sender: kernel-testers-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: To: Arjan van de Ven Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List --=-N7OvyR/HkP2IoUFv5dAc Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On lun, 2008-12-08 at 07:24 +0100, Yves-Alexis Perez wrote: > On dim, 2008-12-07 at 15:12 -0800, Arjan van de Ven wrote: > >=20 > > > > at least in some of the cases where this has been seen the cause > > is > > > > the following: > > > > The i915 DRM driver used to do polling for completion, busy > > > > waiting. It moved to be interrupt driven, which is usually better > > > > for power, but it will show up as more wakeups in powertop.... > > >=20 > > > IOW, this is not a regression? > >=20 > > I don't know about this specifc case (not enough information) but for > > the case I described it's not a regression. Going to interrupt driven > > from busy waiting is an improvement not a regression :) >=20 > Well, several thousand or more interrupts really seems like a > regression :). But it seems that's the same thing as the =E2=80=9CIRQ > spinning=E2=80=9D (there was a thread on dri-devel about that). >=20 > It seems fixed with a patch from Matthew Garrett applied to > drm-intel/for-airlied but I don't think this has been applied to Linus > master. And it seems the same thing as https://bugs.freedesktop.org/show_bug.cgi?id=3D18609 Cheers, --=20 Yves-Alexis --=-N7OvyR/HkP2IoUFv5dAc Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEABECAAYFAkk8v5EACgkQTUTAIMXAW65VPACgjy4sTQKfUdrovAB0Gl85du7e upwAoLDQfHNRZBvuIgE7W5ZHmvxPS2Uj =UzHe -----END PGP SIGNATURE----- --=-N7OvyR/HkP2IoUFv5dAc--