[mythtv] Ticket #2335: LiveTV hangs when a recording is finished and a new on starts (no channel change)
mythtv at miwers.dk
mythtv at miwers.dk
Wed Jul 25 22:03:34 UTC 2007
eric.bosch at comcast.net wrote:
> I don't believe it is an ivtv issue, as I can have the live-tv hang on
> show transition, even though the program is scheduled to record, and
> once I can get back to the menu, and then play it back from recordings,
> it plays fine. My suspicion is that there is some sort of race
> condition or timing issue in that perhaps there is a short delay where
> the new file is opened, and actually catalogged. What kind of
> filesystem implementations are you running? I have an LVM managed set
> of virtual drives, one of which being a 500GB filesystem for the
> recordings. My backend uses NFS filesystem for the recordings, and both
> frontends are configured to stream from remote server. If I don't do
> this, then I have severe stuttering and eventual stall on livetv from
> remote tuners.
>
Yeah, you're right...
My setup consists of one backend server also acting as a frontend, and a
second frontend machine streaming from the backend server. All testing
is done on the locally on the backend.
All recording happens to a separate 250GB physical SATA disk on the
backend with a reiserfs partition. Here are some hdparm timing tests,
for what it's worth:
server ~ # hdparm -Tt /dev/sda1
Timing cached reads: 898 MB in 2.00 seconds = 449.10 MB/sec
Timing buffered disk reads: 148 MB in 3.01 seconds = 49.23 MB/sec
Timing cached reads: 962 MB in 2.00 seconds = 480.36 MB/sec
Timing buffered disk reads: 160 MB in 3.02 seconds = 53.04 MB/sec
Timing cached reads: 1014 MB in 2.00 seconds = 506.58 MB/sec
Timing buffered disk reads: 156 MB in 3.02 seconds = 51.59 MB/sec
/Miwer
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