From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vasily Khoruzhick Subject: Re: Interrupt latency on some 945GM platforms Date: Tue, 14 Sep 2010 00:41:18 +0300 Message-ID: <201009140041.23645.anarsoul@gmail.com> References: <201009132336.17310.anarsoul@gmail.com> <201009140010.14783.anarsoul@gmail.com> <20100913141955.752cbdea@jbarnes-desktop> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0186487862==" Return-path: Received: from mail-ey0-f177.google.com (mail-ey0-f177.google.com [209.85.215.177]) by gabe.freedesktop.org (Postfix) with ESMTP id CB5129E7A4 for ; Mon, 13 Sep 2010 14:42:18 -0700 (PDT) Received: by eye22 with SMTP id 22so3377781eye.36 for ; Mon, 13 Sep 2010 14:42:17 -0700 (PDT) In-Reply-To: <20100913141955.752cbdea@jbarnes-desktop> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: Jesse Barnes Cc: intel-gfx@lists.freedesktop.org, Thomas Gleixner , linux-kernel@vger.kernel.org List-Id: intel-gfx@lists.freedesktop.org --===============0186487862== Content-Type: multipart/signed; boundary="nextPart1564341.KjfylMJfeW"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit --nextPart1564341.KjfylMJfeW Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable =D0=92 =D1=81=D0=BE=D0=BE=D0=B1=D1=89=D0=B5=D0=BD=D0=B8=D0=B8 =D0=BE=D1=82 = 14 of September 2010 00:19:55 =D0=B0=D0=B2=D1=82=D0=BE=D1=80 Jesse Barnes = =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB: > On Tue, 14 Sep 2010 00:10:08 +0300 >=20 > Vasily Khoruzhick wrote: > > =D0=92 =D1=81=D0=BE=D0=BE=D0=B1=D1=89=D0=B5=D0=BD=D0=B8=D0=B8 =D0=BE=D1= =82 13 of September 2010 23:44:41 =D0=B0=D0=B2=D1=82=D0=BE=D1=80 Jesse Barn= es =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB: > > > I remember seeing a similar problem on an Eee PC I had; it seemed to = be > > > timer/interrupt related somehow. If I booted with clocksource=3Dtsc > > > (or maybe it was pit) I got nice smooth animations, but if I used the > > > HPET things were really slow. > > >=20 > > > Does the same work for you? > >=20 > > Yeah, it works for me (will use it as temporary workaround). But it > > definitely is not clean solution, as I can't use nohz mode with tsc > > clocksource :) >=20 > Thomas, does this ring any bells for you? >=20 > I think the root symptom of the issue is that we get a much reduced i915 > interrupt frequency (or no interrupts) on some 945GM platforms when > using HPET as our clock source. >=20 > In fact, on the platform I tested, it seemed that the i915 IRQs wouldn't > generate interrupts at all when HPET was used. But shaking the mouse or > generating network traffic was enough to get i915 interrupts coming in, > even though neither of those interrupts were shared with the i915 > device. >=20 > Here's hoping you have some ideas to try... >=20 > Thanks, Jesse, is it possible to disable wait for vsync somehow? cpufreq is not=20 working for me with nohz=3Dno for some reason, as result cpu temperature an= d=20 power usage are higher. I prefer to see tearing but with low power usage an= d=20 without jerky keyboard :) Regards Vasily --nextPart1564341.KjfylMJfeW Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.16 (GNU/Linux) iEYEABECAAYFAkyOmoMACgkQRM6pQpltKE5WFwCgvIK9Bb3sIzsIqhYAcun7bIxl FC8AoNVQ0Lh1S7oHf+A7XCQpXh/TULWD =pDik -----END PGP SIGNATURE----- --nextPart1564341.KjfylMJfeW-- --===============0186487862== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx --===============0186487862==--