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

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Alan wrote:
> > But it isn't supported by older kernels and most versions of Windows.  A 
> >     
> Linux 2.4.x AHCI drivers exist. Windows 95/98 are lacking them as is NT
> that much is true, but Win2K and later support AHCI. AHCI is also very
> nice from a virtualisation point of view as you get commands in queues
> and you can batch them up sensibly.
>
> For older windows there is the ADMA interface which is saner to emulate
> than SFF but not very sane.
>
>   
> > 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.
> >     
> Don't even get me started on qemu. The qemu "emulation" of ATAPI is a good
> reason to use anything else as an interface.
>   
Feel free to submit patches.

Regards,

Anthony Liguori

> Alan
>   

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