Re: [Qemu-devel] [RFC] Memory API and fine grained Memory Regions

[Avi Kivity]

On 10/29/2012 01:37 AM, John Williams wrote:

>> IMO, an mr per reg would just add a massive overhead for no win.
> 
> I tend to agree with Edgar here - QEMU has a careful line to walk between 
> being an emulator and an RTL simulator.
> 
> Any WAG on the runtime overhead of a mem region per register vs a 
> switch-based decodes in read/write handlers?
> 

Actually a region-per-register can be faster, since the subpage logic
will dispatch the access directly to the handler, instead of going first
to the device handler, then following the switch.

-- 
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