AMD IOMMU [PSARC/2008/561]

[Matthew Jacob]

On 09/03/08 17:24, Vikram Hegde wrote:
> Hi,
>>
>> No, it's a measurable value- not subjective. 
> I wasn't talking about the performance number but rather about 
> "acceptable". Some may argue that for certain drivers the slight 
> reduction in performance is more than compensated by the several 
> benefits that an IOMMU offers (note that SPARC side has been 
> functioning with IOMMU without complaints about performance). For 
> certain drivers it may turn out that the owners find the performance 
> reduction undesirable. It all depends on the driver owners.

And the P-team for the platform.
>
>>> We have always planned to provide the ability to disable the IOMMU 
>>> on a per driver basis. Does that address your performance concerns ?
>>>
>> Yes, but as this is a spec in advance of actual implementation, could 
>> you make sure that 'plan' is on record? 
> ok, I will send an addendum to the spec shortly.
>

Thank you.