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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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