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    SubjectRe: ISDN massive packet drops while DVD burn/verify
    On Mon, 5 May 2003 18:46:53 +0200
    Karsten Keil <kkeil@suse.de> wrote:

    > > How did we manage to become that bad?
    >
    > Its not so bad, the problem is how do you tune the system. If you prefer to
    > not interrupt the IDE transfers, which seems to be the default case, you
    > loose IRQ latency, which doesn't matter in much cases, but not on
    > this. You can tune it (hdparm work also with cdwriters, since
    > even if it use ide-scsi, the underlying driver is the ide driver.

    You mean UDMA 2 does not make it (which I had in the test case)?

    # hdparm -i /dev/hdc

    /dev/hdc:

    Model=SONY DVD RW DRU-500A, FwRev=2.0c, SerialNo=DA5B9D3D
    Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
    RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
    BuffType=unknown, BuffSize=0kB, MaxMultSect=0
    (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
    IORDY=on/off, tPIO={min:180,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
    AdvancedPM=no
    Drive conforms to: device does not report version: 4 5 6

    > This all don't say that here maybe also other problems around, but I have no
    > better explanation.

    Hm, this looks like the unresolved sleeping AVM Fritz2 syndrome to me: no idea
    of what's really going on ...

    --
    Regards,
    Stephan
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