Preempt? (was Re: Cannot enable DMA on SATA drive (SCSI-libsata,VIA SATA))

[Roland Dreier]

    Jeff> I strongly recommend disabling kernel preemption.  It is a
    Jeff> hack that hides bugs.

Why do you say that?  Preempt seems to be the cleanest way to low
latency, and if anything it exposes locking bugs and races rather than
hiding anything.

Thanks,
  Roland
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