On Tue, 2004-03-09 at 20:57, Felix KÃhling wrote: > On Tue, 09 Mar 2004 16:25:43 +0100 > Michel DÃnzer <[EMAIL PROTECTED]> wrote: > > > On Tue, 2004-03-09 at 12:29, Felix KÃhling wrote: > > > > > > We discussed this before and it was concluded that there needs to be > > > some sort of high priority command queue. IIRC certain hardware (was it > > > i8xx?) has such a high priority queue. Is there a good way to implement > > > one in software if the hardware doesn't have such an extra queue? > > > > Radeons do have two streams, but they're not strictly about high and low > > priority. We use the primary stream for the ring buffer and the > > secondary for indirect buffers. It might be interesting to explore > > whether driving the primary in push/PIO mode would allow to handle this > > better, and what if any impact it would have on overall performance. > > If the two streams are not about priority, are they processed in > parallel?
No, you can think of indirect buffers as secondary stream detours of the primary stream. > Is it necessary to use the secondary stream for indirect buffers or > could they go to the primary stream as well? I don't think that's possible. The primary stream is geared towards the ring buffer while the secondary is geared towards indirect buffers. > In that case we could keep the secondary stream mostly idle and only > use it for low latency swapping. Even if it was possible, this couldn't be done asynchronously. AFAICT we can only try and keep the latency of the primary stream low. -- Earthling Michel DÃnzer | Debian (powerpc), X and DRI developer Libre software enthusiast | http://svcs.affero.net/rm.php?r=daenzer ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click -- _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
