Messages in this thread | | | Subject | Re: old radeon latency problem still unfixed? | From | Lee Revell <> | Date | Sun, 26 Feb 2006 16:31:28 -0500 |
| |
On Mon, 2006-02-27 at 08:11 +1100, Benjamin Herrenschmidt wrote: > > AFAICT it's more like trading 3D performance for having audio work at > > all. Other video drivers that were too aggressive and caused audio > > dropouts (VIA) were fixed, even though there was a slight performance > > cost. > > In addition, the radeon DRI shouldn't do active spinning like that in > "normal" circumstances ... it should instead block on interrupts. if it > does, I suppose that could safely be considered as a bug in the radeon > DRM/DRI driver. It will do such loops on engine reset and such, which > happen on X launch, VT switches or in case of lockups... I have to > double check what happens in the code path used for 2d/3d transitions > though, those might be a problem.
What about switching from 2D->3D mode, like when xscreensaver kicks in? IIRC people reported audio underruns when that happened but I could never narrow it down any further.
If as Arjan said the only lock this driver takes is the BKL then it's either a local config issue (ancient kernel or failure to enable preempt BKL) or something at the hardware level... I'm waiting for more info from the original reporter.
Lee
- 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/
| |