Re: [Qemu-devel] [sneak preview] major scsi overhaul

[Gerd Hoffmann]

  Hi,

> > Doesn't fly. Either every SCSI HBA uses QEMUSG64List (thus making this
> > aequivalent to the next option from the scsi point of view), or
> > scsi-disk would have to support both formats.
>
> A device or device set which is always 64-bit would always use
> QEMUSG64List. A device which is always 32-bit would use QEMUSG32List.

A scsi-disk can be connected to both 32-bit and 64-bit HBAs though ...

> > Question is how big the performance hit actually is and whenever we
> > are willing to accept that or not ...
>
> Probably unmeasurable, but the qemu-devel thread size will be very
> measurable so not worth it.

;)

cheers,
  Gerd