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    SubjectRe: ISDN massive packet drops while DVD burn/verify
    On Mon, May 05, 2003 at 07:26:52PM +0200, Stephan von Krawczynski wrote:
    > On Mon, 5 May 2003 18:46:53 +0200
    > Karsten Keil <> 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

    No the mode doesn't matter so much here, what give

    hdparm -v /dev/hdc

    > > 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 ...

    Hmm, don't remember this issue at the moment.

    Karsten Keil
    SuSE Labs
    ISDN development
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