From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wilson Subject: Re: [PATCH] tests/gem_ringfill: Exercise all rings Date: Mon, 20 Feb 2012 22:45:40 +0000 Message-ID: References: <1329776520-10968-1-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 mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTP id 3FC989E79D for ; Mon, 20 Feb 2012 14:45:46 -0800 (PST) In-Reply-To: <1329776520-10968-1-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, 20 Feb 2012 22:22:00 +0000, Chris Wilson wrote: > On SandyBridge, the BLT commands were split from the RENDER commands as > well as the BSD split inherited from Ironlake. So we need to make sure > we do exercise each ring, and in order to do so we also need to make > sure each batch takes longer to execute than it takes for us to > submit it. Whilst this found the bug, it does presume the BLT and RENDER copy are equally fast. So on a SNB without the autoreported head, it fails to fill the BLT ring as the untiled RENDER copy is far too slow. -Chris -- Chris Wilson, Intel Open Source Technology Centre