Scenario : - Backend recording NBC in HD 1080i - Frontend playing the NBC show in 1080i
Result : Jerky playback As soon as the show finish recording, the playback is fine. If I do the same on a recording in 720p, it doesn't happen. The only I could see is that the CPU is used at 45% and the "wa" state uses the rest (0-1 % idle). Usage when recording on backend and watching on frontend : top - 22:58:38 up 4:21, 4 users, load average: 1.90, 1.19, 1.13 Tasks: 117 total, 1 running, 115 sleeping, 0 stopped, 1 zombie Cpu(s): 41.7% us, 3.3% sy, 0.0% ni, 0.3% id, 51.3% wa, 3.3% hi, 0.0% si Mem: 1035872k total, 936812k used, 99060k free, 6528k buffers Swap: 690752k total, 708k used, 690044k free, 579356k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6293 root 15 0 379m 147m 19m S 42.3 14.6 1:19.09 mythfrontend 3026 root 15 0 194m 60m 7720 S 1.7 6.0 3:09.03 X Usage when not recording and watching the same show : top - 23:01:19 up 4:24, 4 users, load average: 2.40, 1.76, 1.35 Tasks: 117 total, 3 running, 113 sleeping, 0 stopped, 1 zombie Cpu(s): 43.2% us, 0.7% sy, 0.0% ni, 55.1% id, 0.3% wa, 0.7% hi, 0.0% si Mem: 1035872k total, 936116k used, 99756k free, 6788k buffers Swap: 690752k total, 708k used, 690044k free, 576456k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6293 root 15 0 382m 149m 19m S 42.0 14.8 2:59.47 mythfrontend 3026 root 15 0 194m 60m 7720 S 0.7 6.0 3:19.36 X Any ideas why the "wa" is using so much of the CPU time only when the backend is recording? wa: Time spent waiting for IO. Prior to Linux 2.5.41, shown as zero. Steve M. _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
