From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wilson Subject: Re: [PATCH 2/2] drm/i915: enable plain RC6 on Sandy Bridge by default Date: Sat, 11 Feb 2012 12:59:25 +0000 Message-ID: References: <1328963655-12128-1-git-send-email-eugeni.dodonov@intel.com> <1328963655-12128-3-git-send-email-eugeni.dodonov@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mga03.intel.com (mga03.intel.com [143.182.124.21]) by gabe.freedesktop.org (Postfix) with ESMTP id EA8229E78B for ; Sat, 11 Feb 2012 04:59:32 -0800 (PST) In-Reply-To: <1328963655-12128-3-git-send-email-eugeni.dodonov@intel.com> 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: intel-gfx@lists.freedesktop.org Cc: Eugeni Dodonov List-Id: intel-gfx@lists.freedesktop.org On Sat, 11 Feb 2012 10:34:15 -0200, Eugeni Dodonov wrote: > This is yet another chapter in the ongoing saga of bringing RC6 to Sandy > Bridge machines by default. > > Now that we have discovered that RC6 issues are triggered by RC6+ state, > let's try to disable it by default. Plain RC6 is the one responsible for > most energy savings, and so far it haven't given any problems - at least, > none we are aware of. > > So with this, when i915_enable_rc6=-1 (e.g., the default value), we'll > attempt to enable plain RC6 only on SNB. For Ivy Bridge, the behavior > stays the same as always - we enable both RC6 and deep RC6. We appear to be lacking a bunch of tested-bys for what we proclaim to have been tested. -Chris -- Chris Wilson, Intel Open Source Technology Centre