Re: [PATCH 0/3] PCI: vmd: Reducing tail latency by affining to the storage stack

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On Thu, Nov 07, 2019 at 03:40:15PM +0000, Derrick, Jonathan wrote:
> On Thu, 2019-11-07 at 07:37 -0800, hch@xxxxxxxxxxxxx wrote:
> > On Thu, Nov 07, 2019 at 02:12:50PM +0000, Derrick, Jonathan wrote:
> > > > How does this compare to simplify disabling VMD?
> > > 
> > > It's a moot point since Keith pointed out a few flaws with this set,
> > > however disabling VMD is not an option for users who wish to
> > > passthrough VMD
> > 
> > And why would you ever pass through vmd instead of the actual device?
> > That just makes things go slower and adds zero value.
> 
> Ability to use physical Root Ports/DSPs/etc in a guest. Slower is
> acceptable for many users if it fits within a performance window

What is the actual use case?  What does it enable that otherwise doesn't
work and is actually useful?  And real use cases please and no marketing
mumble jumble.



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