On Tue, Feb 01, 2005 at 08:19:17PM -0500, Eric Lammerts wrote: > > Hi, > I had a lot of problems with the transport stream input on the > SAA7134. Even the slighest bit of other system activity caused data > corruption. This patch corrects the switching of the two DMA > buffers.
Thanks, merged (and fixed a simliar issue in saa7134-video.c along the way ;). > FYI, the problems only occur on Transmeta TM5800/TM5400 Crusoe boards > (1GHz/533MHz). When I move the SAA7134 board to a 400MHz Celeron, no > problems at all. I measured the interrupt latency of the SAA7134 > interrupt on the Crusoe, and that peaks to >1000us when power > management is enabled and other activity (IDE DMA) is taking place!! > That may explain why other people haven't seen this problem. It has shown up before already (long ago), thats why the two-buffer thingy exists in the first place. Looks like 2.6 really makes a better job on low-latency than 2.4 did, otherwise that would have been noticed earlier... Gerd - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
