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    SubjectRe: 2.4.21 ServerWorks DMA Bugs
    On Fri, 4 Jul 2003, Ryan Mack wrote:

    > I've real the other threads but nothing touches on my specific issue.
    > I have a dual P4 Xeon Dell PowerEdge 1600SC with a Fusion MPT SCSI
    > controller and a ServerWorks CSB5 IDE chipset. All the HDs are on the
    > SCSI bus, and only my CD reader and my DVD writer are on the IDE bus
    > (one on each channel). Hyperthreading is enabled (4 logical
    > processors). I am using GCC 3.2.2.
    > The CD readers is the blacklisted 'SAMSUNG CD-ROM SC-148C' and I never
    > use it so I can remove it if needed. The DVD writer is a 'SONY DVD RW
    > DRU-500A'. Both are going through the ide-scsi driver. Whenever I
    > read/write CDs in the DVD writer, I get very high system load (50% on
    > one CPU), even though DMA seems to be enabled.

    If you are writing CDs with unusual block sizes (audio CDs, (S)VCDs,
    RAW mode -> blocksize != 2048) you won't get DMA with ide-scsi, no
    matter what you do. It's simply not supported.


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