From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756318Ab1KWPDw (ORCPT ); Wed, 23 Nov 2011 10:03:52 -0500 Received: from casper.infradead.org ([85.118.1.10]:55122 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756287Ab1KWPDu (ORCPT ); Wed, 23 Nov 2011 10:03:50 -0500 Message-ID: <1322060623.15493.168.camel@shinybook.infradead.org> Subject: Re: [PATCH] drm/i915: By default, enable RC6 on IVB and SNB when reasonable From: David Woodhouse To: Daniel Vetter Cc: rajesh.sankaran@intel.com, Keith Packard , Matthew Garrett , intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Date: Wed, 23 Nov 2011 15:03:43 +0000 In-Reply-To: <20111123143931.GE3864@phenom.ffwll.local> References: <1321684889-18691-1-git-send-email-keithp@keithp.com> <20111122201531.GD5547@srcf.ucam.org> <861uszfrah.fsf@sumi.keithp.com> <20111123102643.GB3864@phenom.ffwll.local> <1322056914.15493.158.camel@shinybook.infradead.org> <20111123143931.GE3864@phenom.ffwll.local> Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-xuRNAPaKWWjft+89/Ach" X-Mailer: Evolution 3.2.1 (3.2.1-2.fc16) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-xuRNAPaKWWjft+89/Ach Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2011-11-23 at 15:39 +0100, Daniel Vetter wrote: > At least for the dmar+gfx+semaphores hang I can reproduce, just disabling > dmar with intel_iommu=3Digfx_off is not good enough and iirc the same hol= ds > for the dmar+rc6 hangs reported.=20 Um... let me restate that for clarity (and partly for Rajesh's benefit). The DMAR associated with the integrated graphics is *disabled*. Turned off. Not active. Ever. You have a problem when you enable the *other* DMAR units in the system, which should not be affecting the graphics device in any way. When you do this, you see 'hangs' with semaphores and RC6. Is there a better description of these 'hangs' somewhere? Is the hardware completely locked? These hangs go away when you disable the DMAR units. Again, that is the *other* DMAR units in the system that have nothing to do with graphics. While I'm getting quite used to DMAR-related errata, this one does make me stop and think 'wtf?'. It just seems so incongruous that disabling an *unrelated* IOMMU would make the problem go away, and it makes me wonder if it's actually a timing-related issue which is always there, but something about the use of DMAR for network/disk/etc. makes it more likely to trigger? We definitely need the hardware folks to get to the bottom of this one. --=20 dwmw2 --=-xuRNAPaKWWjft+89/Ach Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIITvzCCBi0w ggQVoAMCAQICAwCtOTANBgkqhkiG9w0BAQUFADBUMRQwEgYDVQQKEwtDQWNlcnQgSW5jLjEeMBwG A1UECxMVaHR0cDovL3d3dy5DQWNlcnQub3JnMRwwGgYDVQQDExNDQWNlcnQgQ2xhc3MgMyBSb290 MB4XDTEwMDYxMjEwMDMwMFoXDTEyMDYxMTEwMDMwMFowgegxGDAWBgNVBAMTD0RhdmlkIFdvb2Ro b3VzZTEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzEfMB0GCSqGSIb3DQEJARYQ ZGF2aWRAd29vZGhvdS5zZTEoMCYGCSqGSIb3DQEJARYZZGF2aWQud29vZGhvdXNlQGludGVsLmNv bTEkMCIGCSqGSIb3DQEJARYVZHdtdzJAbGludXguaW50ZWwuY29tMTcwNQYJKoZIhvcNAQkBFigx MDg3MmEwN2Y2ZDdlMWUwN2Y1NWZmMTcyYTAzYjMwMGVlYWFkMjAzMIIBIjANBgkqhkiG9w0BAQEF AAOCAQ8AMIIBCgKCAQEA29OPhNvMxBMW83psWdVhZDtmJvgN+tBEp1r6MZamONsR0k81a6fDFwJz 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