The harddrive is a brand new samsung 200GB. Although, the HD Ring Buffer might be set a bit high "14400" and maybe the jerkyness happens when that buffer is written to disk.
I'll try to lower that quite a bit to see if it makes a difference... Is there a way for mythfrontend to buffer more data so it doesn't starve when mythbackend is busy doing something else? Steve On 1/5/06, Steve Adeff <[EMAIL PROTECTED]> wrote: > On Thursday 05 January 2006 23:02, Steve Malenfant wrote: > > 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. > > sounds more like your harddrive is unable to keep up. > > -- > Steve > _______________________________________________ > mythtv-users mailing list > [email protected] > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users > _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
