All,<br><br>I just updated my FC6-x86_64 system to the latest patches and the latest myth rpms (0.20-148). (I am now running kernel 2.6.18-1.2868, on AMD64/2800, with 768MB)<br><br>I am now experiencing a number of problems with my DVB-S, but NOT with my PVR-150!
<br><br>- I get "hickups" while watching live Sat. TV; the picture freezes momentarily, then continues.<br>- on Sat. recordings, I get lots of jumps, where the recording simply misses several seconds<br><br>In the backend log, I see the following lines
<br> DevRdB(0) Error: Driver buffers overflowed<br><br>and the front end log show things like:<br>NVP: prebuffering pause<br>RingBuf(/mnt/store/recordings/2153_20061221210417.mpg): Taking too long to be allowed to read..
<br>RingBuf(/mnt/store/recordings/2153_20061221210417.mpg): Waited 1.0 seconds for data to become available...<br><br>This seems to mean disk access issues? However, my disk and its partitions are running on a 3Ware 8006 raid1
controller with dual SATA150 drives, and hdparm testing show performace
as expected. (mythfrontend is also running as suid root)<br><br>I did some other testing, to see if I can eliminate the base system. When I run the following in three different shells, basically simulating what myth live tv does, the picture is just fine:
<br><br>szap #tune the DVB card<br><br>cat /dev/dbv/adapter0/dvr0 > /mnt/store/FILE.mpg #record from dvb-s card to file<br><br>mplayer /mnt/store/FILE.mpg #play file while being 'recorded'<br><br>Cpu utilization with the above 3 is about 10%, with Myth Livetv it's about 15-20%
<br><br>I've notived that vmstat shows virtually no disk waits (WA value) when I run things in the 3 shells, but with Mythtv I see this jump from 1 to as high as 6 at times. <br><br>I have backed down to the original kernel, build 2798, and to myth
0.20.-147.1 with the same results; the szap/cat/mplayer test works fine under 2.6.18-2798. Nvidia 5200 drivers are v8776<br><br>Now I am starting to expect something else, like QT libraries, or some other piece that got upgraded?
<br><br>Any suggestions?<br><br>thanks,<br><br>Johan<br><br>