On Tue, Mar 19, 2002 at 11:15:12PM -0500, Paul Davis wrote:
> >I am getting the same with stock 2.4.18, DELL Inspiron laptop (Maestro
> >3i), my test is:
> >
> >copy a cd image file from one partition to another, while trying to play
> >an mp3 using mpg123.
> >
> >The mp3 skips all over the place.
>
> since you almost certainly have IDE drivers, have you configured them
> correctly using hdparm? these are source of considerable scheduling
> latency, in ways that AFAIK are not improved by any of the "latency
> reducing" patches available. don't ask me how to configure them - i
> only use SCSI drives - but a quick google search should reveal
> relevant advice.
thanks
hdparm improves the situation, but I still get some (minimal) skips now:
zen8100a:~# hdparm /dev/hda
/dev/hda:
multcount = 16 (on)
I/O support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 7296/255/63, sectors = 117210240, start = 0
busstate = 1 (on)
My current 'test':
- playing an mp3
- running make clean && make bzImage
- copying a cd image between two partitions
- loading up the odd application (eg. mozilla)
With hdparm settings I've tried:
- 2.4.18 + preempt + lockbreak
- 2.4.18 + lowlatency
- 2.4.19-pre3-ac3 + preempt
These seem to all give the same minimal skips with above activities.
No skips with only the kernel compile (not doing the large copy).
ta
zen
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This archive was generated by hypermail 2b29 : Sat Mar 23 2002 - 22:00:20 EST