Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268236AbUIKReJ (ORCPT ); Sat, 11 Sep 2004 13:34:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268248AbUIKRcM (ORCPT ); Sat, 11 Sep 2004 13:32:12 -0400 Received: from rproxy.gmail.com ([64.233.170.195]:34041 "EHLO mproxy.gmail.com") by vger.kernel.org with ESMTP id S268232AbUIKR2D (ORCPT ); Sat, 11 Sep 2004 13:28:03 -0400 Message-ID: <9e47339104091110272101ecfb@mail.gmail.com> Date: Sat, 11 Sep 2004 13:27:59 -0400 From: Jon Smirl Reply-To: Jon Smirl To: Alan Cox Subject: Re: radeon-pre-2 Cc: Dave Airlie , =?ISO-8859-1?Q?Michel_D=E4nzer?= , =?ISO-8859-1?Q?Felix_K=FChling?= , DRI Devel , lkml In-Reply-To: <1094919681.21157.119.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit References: <9e47339104091011402e8341d0@mail.gmail.com> <1094853588.18235.12.camel@localhost.localdomain> <1094873412.4838.49.camel@admin.tel.thor.asgaard.local> <1094913222.21157.61.camel@localhost.localdomain> <9e47339104091109463694ffd3@mail.gmail.com> <1094919681.21157.119.camel@localhost.localdomain> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1370 Lines: 42 On Sat, 11 Sep 2004 17:21:22 +0100, Alan Cox wrote: > On Sad, 2004-09-11 at 17:46, Jon Smirl wrote: > > User 1's game queues up 20ms of 3D drawing commands. > > Process swap to user 2. ->quiesce() is going to take 20ms. > > User 2's timeslice expires and we go back to user 1. > > User 1 queues up another 20ms. > > > > User 2's editor is never going to function. > > If you implement it wrongly sure. If you implemented it right then > this occurs. > > User 1 queues 20 ms of 3D commands > User 1 is pre-empted > User 2 wants the 2D engine > User 2 beings wait for 2D > User 2 sleeps > User 1 wakes > User 1 beings wait for 3D but discovers a claim is in progress > User 1 sleeps > User 2 wakes, runs commands This model destroys the parallel processing between the main CPU and the GPU. > > If you have DRI loaded then as you rightly say the obvious desired > outcome is that the fb engine either turns acceleration off or switches > to using the DRI layer. > > But this is a pretty obscure case, and one we can't even begin to > support yet anyway. > > -- Jon Smirl jonsmirl@gmail.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/