From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wilson Subject: Re: [PATCH] drm/i915: Prefer to pageflip on the active ring on IvyBridge Date: Thu, 26 Apr 2012 20:42:15 +0100 Message-ID: <1335469371_60931@CP5-2952> References: <1334586581-15663-1-git-send-email-chris@chris-wilson.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from fireflyinternet.com (smtp.fireflyinternet.com [109.228.6.236]) by gabe.freedesktop.org (Postfix) with ESMTP id 419BDA0F78 for ; Thu, 26 Apr 2012 12:42:56 -0700 (PDT) Received: from cantiga.alporthouse.com (unverified [78.156.66.37]) by fireflyinternet.com (Firefly Internet SMTP) with ESMTP id 112091935-1500050 for ; Thu, 26 Apr 2012 20:42:51 +0100 In-Reply-To: <1334586581-15663-1-git-send-email-chris@chris-wilson.co.uk> 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 List-Id: intel-gfx@lists.freedesktop.org On Mon, 16 Apr 2012 15:29:41 +0100, Chris Wilson wrote: > IvyBridge has the ability to pageflip from either the Render or Blitter > rings. Scheduling the pageflip on the active ring (if the new scanout is > being rendered on either pipeline) saves inserting a semaphore (if > available) and forcing a stall on both pipelines. We presume that the > current scanout is inactive. As a follow-up to my own suggestion; don't even think of pageflipping from the render ring, it is full of disappointment. -Chris -- Chris Wilson, Intel Open Source Technology Centre