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Re: [Xen-devel] Re: Improving hvm IO performance by using self IO emulator (YA io-emu?)

> Can SATA drives queue multiple outstanding requests?  Thought some newer rev 
> could, but I may well be misremembering - in any case we'd want something 
> that was well supported.

Most SATA drives support NCQ which is sensible queuing and all the rest
of it. Some early ones get it badly wrong. You need a controller
interface that handles it and a device that handles it. Devices
pretending to be PATA controllers lack the brains but AHCI is a current
intel standard used by many vendors for this role and intended to replace
SFF style IDE.


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