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

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [sneak preview] major scsi overhaul
Date: Mon, 09 Nov 2009 14:39:24 +0100
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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.



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