Hi, Last Thursday I put together a mythtv box (both for capture and playback)
ASUS Pundit P1-AH1 Barebone Kit Athlon64 3500+ North Bridge: nVidia Crush 51PV South Bridge: nVidia MCP 51 Integrated GeForce 6 GPU Realtek ALC861 Added: PVR 150 MCE 160 GB SATA HD LG DVD RW 512 PC3200 MB RAM Followed the Fedora Core 5 mythtv setup by Jarod Wilson - all updates were applied from atrpms/freshrpms. Note -- I had to add the kernel parameter irqfixup (some issue with the nvidia SATA Controller. Everything seemed to work great until I tried to watch a recording while recording something else - what ended up happening was the DMA errors that have been mentioned many times on this mailing list as well as many others. Nov 18 17:43:52 burns kernel: ivtv0 warning: ENC: (0) DMA Error 0x0000000b 00000001 Nov 18 17:43:52 burns kernel: ivtv0 warning: ENC: (1) DMA Error 0x0000000b 00000005 Nov 18 17:43:52 burns kernel: ivtv0 warning: ENC: (2) DMA Error 0x0000000b 00000001 Nov 18 17:43:52 burns kernel: ivtv0 warning: ENC: (3) DMA Error 0x0000000b 00000001 Nov 18 17:43:52 burns kernel: ivtv0 warning: ENC: REDO DMA took too many tries. Nov 18 17:43:52 burns kernel: ivtv0 warning: Error Encoder DMA I tried everything I saw on the mailing lists - turning off the CPU Quiet n' Cool setting and all other CPU throttling, changing the latency timings on the pci devices, disabling the sound card, the IDE devices, the nVidia graphics accelerations but nothing seemed to help. I also tried compiling my own ivtv drivers from the 0.9 development tree - but that also didn't work. I decided that I will wait until the next ivtv release and for the time being install the pvr card on my other mythtv machine. So today I see that there is a new release of ivtv so I popped the card out and installed it in the new machine (Pundit p1-ah1).... WOW! Things started to work, I had no DMA errors, all PCI devices enabled, Quiet n' Cool enabled and things seemed to be stable (I've been test capturing for the past few hours). Thank You very much Hans and all others who contributed !!!! I am not sure what changed between 0.8 and 0.8.1 (that might affect my situation) but it seems to have fixed my issues. As I mentioned, I compiled and installed the 0.9 development trunk of the ivtv drivers but it did not solve anything - I just thought I would post my experiences incase it helps diagnose what the cause of these DMA errors are. I will continue to test the setup and post if anything goes wrong. Rajeev. _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
