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    FromDominique Dumont <>
    SubjectPb with simultaneous SATA and ALSA I/O
    DateMon, 25 Sep 2006 13:55:17 +0200
    Hello
    
    I have some problem using the SPDIF output of my SB Live card while
    performing I/O on my SATA drive. (See [1] for the whole story on the
    ALSA mailing list)
    
    My Yamaha amplifier does not recognize the AC3 (Dolby digital) stream
    from the sdpif plug while performing I/O on my SATA drive.
    
    If I have a lot of I/O (e.g. running md5sum on a 4Gb file), the AC3
    stream is completely broken.
    
    If I have some I/O (e.g. reading a Hi-def movie), I get some AC3
    drop-out even if the CPU is about 50%.
    
    I have the same result with DTS output.
    
    With PCM output, I've noticed a hi-frequency distortion, which means
    that the interaction between SATA and snd module occurs several
    thousands time per second.
    
    My set up is:
    - Debian Linux kernel 2.6.17
    - Sound blaster SB Live 5.1 (snd_emu10k1 module)
    - SATA drive (sata_sil and libata module)
    - A7n8x deluxe mobo
    - AMD XP 3200 
    
    So far I verified that:
    - AC3 output works fine when SATA drive is left alone
    - AC3 output works fine when running md5sum on a PATA drive
    - DTS output works fine on the mobo SPDIF output (snd_intel8x0 module)
      even when running md5sum on the SATA drive. (cannot try AC3 stream
      because of Soundstorm chip :-( )
    - Preemp kernel option does not fix the problem
    - when running md5sum on SATA drive, alsa driver report a starvation
      (xrun) every few seconds, not thousands of time per second.
    
    Could someone shed some light on this problem ?
    
    What can I do to help debug this problem ?
    
    Thanks
    
    
    [1] http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg17399.html
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