[mythtv-users] Slightly OT: Frame drops
Ian Trider
iantri at gmail.com
Sat Jan 15 09:11:27 EST 2005
Hello,
I was wondering if anyone had some specific advice about frame drops
on my MythTV system. I am using a Hauppauge PVR-350 and PVR-250.
Output is by the PVR-350. The processor is a 2.66ghz Celeron, 256MB
of RAM. CPU usage is not even notable while recording. However, I am
getting framedrops. I'm not quite sure why, since hdparm seems to
suggest that my hard drive is configured properly. I'm using 3mbit/s
for bitrate, so when hdparm says I have a throughput of 50MB/s I fail
to see why this would happen.
The frame drops only occur when recording two programs at once.
Here is what hdparm says:
[root at mythtv mnt]# hdparm -Tt /dev/hda
/dev/hda:
Timing buffer-cache reads: 1508 MB in 2.00 seconds = 752.98 MB/sec
Timing buffered disk reads: 156 MB in 3.02 seconds = 51.61 MB/sec
.. and info about the Hard drive:
[root at mythtv mnt]# hdparm -I /dev/hda
/dev/hda:
ATA device, with non-removable media
Model Number: ST380011A
Serial Number: 5JVEX96Y
Firmware Revision: 8.01
Standards:
Used: ATA/ATAPI-6 T13 1410D revision 2
Supported: 6 5 4 3
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 156301488
device size with M = 1024*1024: 76319 MBytes
device size with M = 1000*1000: 80026 MBytes (80 GB)
Capabilities:
LBA, IORDY(can be disabled)
bytes avail on r/w long: 4 Queue depth: 1
Standby timer values: spec'd by Standard, no device specific minimum
R/W multiple sector transfer: Max = 16 Current = 16
Recommended acoustic management value: 254, current value: 0
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=240ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* READ BUFFER cmd
* WRITE BUFFER cmd
* Look-ahead
* Write cache
* Power Management feature set
* SMART feature set
* Mandatory FLUSH CACHE command
* Device Configuration Overlay feature set
* DOWNLOAD MICROCODE cmd
* General Purpose Logging feature set
* SMART self-test
* SMART error logging
HW reset results:
CBLID- above Vih
Device num = 0 determined by CSEL
Checksum: correct
Any ideas?
--
Ian Trider
iantri at gmail.com
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