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

[Anthony Liguori <aliguori@xxxxxxxxxx>]

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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