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



Alan wrote:
SATA can, yes.  However, as you mention, SATA is very poorly supported.

By what - it works very nicely in current Linux kernels,

But it isn't supported by older kernels and most versions of Windows. A major use of virtualization is running older operating systems so depending on newer kernels is not really an option (if we have a new kernel, we'd prefer to use a paravirtual driver anyway).

 including AHCI
with NCQ and multiple outstanding commands. The fact Xen isn't merged
and is living in prehistory is I'm afraid a Xen problem.

This discussion is independent of Xen. It's equally applicable to KVM and QEMU so please don't assume this has anything to do with Xen's merge status.

Regards,

Anthony Liguori



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