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#340428 - 18/12/2010 04:51 Audio stuttering with new disk
Roger carpal tunnel Registered: 18/01/2000 Posts: 5681 Loc: London, UK	I've just replaced the nGB disk (where n < 60) in my empeg with a 160GB Samsung disk. I used the big disk builder, and I've loaded v3a11+hijack, and all of the capacity is visible to emplode. I've loaded about a third of my music onto it, and am just about to load the rest this morning. I have about 40GB of music. I took the empeg out for a test in the car yesterday, and the audio is stuttering a little. It might be hard-disk-spin-up-related, but the hard disk indicator is not always on when it happens, and it tends to be very small glitches of 0.1 second or so. I'm going to get a serial capture at some point today, but is anyone currently aware of similar problems with "large" hard disks and stuttering? _________________________ -- roger
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#340431 - 18/12/2010 12:28 Re: Audio stuttering with new disk [Re: Roger]
mlord carpal tunnel Registered: 29/08/2000 Posts: 14482 Loc: Canada	New notebook drives often have various levels of "power saving" set ON by default. You might be able to check for that with "hdparm -B /dev/sda", and modify it (OFF) with "hdparm -B255 /dev/sda" Cheers
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#340441 - 18/12/2010 16:09 Re: Audio stuttering with new disk [Re: mlord]
Roger carpal tunnel Registered: 18/01/2000 Posts: 5681 Loc: London, UK	Originally Posted By: mlord New notebook drives often have various levels of "power saving" set ON by default. You might be able to check for that with "hdparm -B /dev/sda", and modify it (OFF) with "hdparm -B255 /dev/sda" Good tip. I'll try that later this evening. _________________________ -- roger
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#340448 - 19/12/2010 09:18

Re: Audio stuttering with new disk [Re: Roger]

Roger
carpal tunnel

Registered: 18/01/2000
Posts: 5681
Loc: London, UK

Originally Posted By: Roger

Originally Posted By: mlord

New notebook drives often have various levels of "power saving" set ON by default. You might be able to check for that with "hdparm -B /dev/sda", and modify it (OFF) with "hdparm -B255 /dev/sda"

Good tip. I'll try that later this evening.

hdparm v9.8 doesn't query the power saving setting with hdparm -B /dev/hda; it reports:

Code:

empeg:/drive0/bin# ./hdparm -V
hdparm v9.8
empeg:/drive0/bin# ./hdparm -B /dev/hda
  -B: bad/missing power-management-mode value (1..255)

It appears that it's disabled anyway ("AdvancedPM=yes: disabled (255)"):

Code:

empeg:/drive0/bin# ./hdparm -i /dev/hda

/dev/hda:

 Model=SAMSUNG HM160HC, FwRev=LQ100-10, SerialNo=S12TJDQZ936826
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4
 BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=312581808
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 *mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: ATA/ATAPI-7 T13 1532D revision 0:  ATA/ATAPI-1,2,3,4,5,6,7

 * signifies the current active mode

I'll leave it playing and capture a serial trace...

_________________________
-- roger

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#340449 - 19/12/2010 09:20 Re: Audio stuttering with new disk [Re: Roger]
Roger carpal tunnel Registered: 18/01/2000 Posts: 5681 Loc: London, UK	Originally Posted By: Roger I've just replaced the nGB disk (where n < 60) in my empeg with a 160GB Samsung disk. I used the big disk builder, and I've loaded v3a11+hijack, and all of the capacity is visible to emplode. I've loaded about a third of my music onto it, and am just about to load the rest this morning. I have about 40GB of music. I've not bothered with set_max_fid or any other bigdisk-related changes, because I don't have much music loaded. _________________________ -- roger
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#340453 - 19/12/2010 16:12 Re: Audio stuttering with new disk [Re: Roger]
tfabris carpal tunnel Registered: 20/12/1999 Posts: 31570 Loc: Seattle, WA	Any chance it's just a glitch in the alpha? _________________________ Tony Fabris
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#340462 - 20/12/2010 07:13 Re: Audio stuttering with new disk [Re: tfabris]
Roger carpal tunnel Registered: 18/01/2000 Posts: 5681 Loc: London, UK	Originally Posted By: tfabris Any chance it's just a glitch in the alpha? Hah. Just this morning, I was thinking: "how long until Tony blames it on the alpha?" Not unless it's got a problem with bigger disks. I've been running the alpha for the last 5 years with no glitching problems. I suppose, worst case, I could just burn some of the space as unused. Edited by Roger (20/12/2010 13:08) Edit Reason: get a quick dig in at Tony _________________________ -- roger
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#340474 - 21/12/2010 05:03 Re: Audio stuttering with new disk [Re: Roger]
tfabris carpal tunnel Registered: 20/12/1999 Posts: 31570 Loc: Seattle, WA	_________________________ Tony Fabris
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#340604 - 27/12/2010 14:54 Re: Audio stuttering with new disk [Re: Roger]
peakmop journeyman Registered: 02/07/2004 Posts: 95 Loc: 384400 km from the Moon	I've had similar problem while running v3a11 player with newly encoded MP3 tracks. However the problem seem to go away after re-flashing to v2 and then back to v3a11.
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