[mythtv-users] HD recording problem
Chris Bare
chris at bareflix.com
Fri Oct 12 14:47:16 UTC 2007
I've just put together a new system for HD mythtv. I am using the HDhomerun
dual tuner, a core2 3Ghz processor and the Seagate 750GB drive.
Last night I had it programmed to record Smallville and My Name Is Earl, both
in HD, both at the same time. While it was recording, I was watching another
show. The playback during recording was fine, but when I watched the recording
of Smallville, it had so many data dropouts (missed frames, broken audio,
scattered macroblocks) that it was unwatchable.
What I find odd is that Earl played back almost perfectly. I've checked CPU
usage, and it is always 10-20% during recording so my best guess is that it's
a disk bandwidth issue. But if that is the case, why wouldn't the dropouts be
scattered between the 2 shows?
Any suggestions on what could be the cause and how to further diagnose it?
are there recommended system performance monitoring tools to run on a myth
system?
In case this is useful, here's the bonnie++ output for my storage partition:
on 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
localhost.locald 4G 66748 88 68523 10 31483 6 73695 87 73377 8 202.2 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 335 1 +++++ +++ 264 1 370 1 +++++ +++ 250 0
localhost.localdomain,4G,66748,88,68523,10,31483,6,73695,87,73377,8,202.2,0,16,335,1,+++++,+++,264,1,370,1,+++++,+++,250,0
---
Chris Bare
chris at bareflix.com
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