On 09/03/08 17:07, Vikram Hegde wrote: > Hi, > >> Abilities to disable the IOMMU as a choice? Performance impact on >> various systems and interactions with other projects that have gone >> to some length to work within S/G and its performance >> characteristics. How will this affect them? Cache effects? >> Interactions with some VM work currently being undertaken? >> >> I can't imagine such a major change being closed/approved/automatic. > Performance is driver dependant. There is no way a single project team > can test the gamut of drivers out there and certify that the IOMMU > will give acceptable performance for all needs (which is itself a > subjective opinion).
No, it's a measurable value- not subjective. > 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?
