Re: CDDA playback on Pismo (and other newer models)

References: [ref]

Michel Dänzer wrote:

Henry Worth wrote:

quoted

Rebuilding the kernel to use SCSI generic devices with IDE SCSI
emulation produced much better, even usable, results. At startup
there are still a couple of dropouts in the first few seconds,
but after that the playback is clean across multiple tracks (even
with a concurrent kernel compile). Piping cdparanoia to /dev/null
shows data rates of 187sectors/sec at all -S settings (and default).
From the the drive's spin-up sounds it seems to always be in
high-speed mode, but unlike the ATAPI driver, there is little
head movement noise.

Does it also improve audio grabbing? With 2.2.15, both IDE and SCSI emulation
almost killed the system...

Haven't seen any instability between the two interfaces
(2.2.17pre15-ben1, though I have had a number of sponstaneous
powerdowns when using the modem this weekend -- the PMU gets testy
when it doesn't get immediate attention, a problem with at least the
recent kernels -- haven't used the modem much with the early
Pismo capable kernels). With cdparanoia's error correction enabled
the SCSI interface is about 30-50% faster ripping tracks (~2-3X). With
the error correction disabled (-Z), both interfaces are the same
speed (~6X) and I get files that compare identically.

** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/