On 05/22/2018 04:19 PM, Peter Maydell wrote:
> On 22 May 2018 at 15:11, Auger Eric <eric.au...@redhat.com> wrote:
>> Hi Peter,
>>
>> On 05/22/2018 03:22 PM, Peter Maydell wrote:
>>> How many substream IDs do we expect to see in practice?
>>
>> Spec says max 20 bits, matching the max size of the PASID
> 
> Right, but do we actually expect to see transactions from
> devices that use the whole 2^20 possible values, or will
> they in practice mostly use 1..5, or somethnig else?

An example given in the spec mentions 8.

"An example would be a compute accelerator with 8 contexts that might
each map to a different user process, but where the single device has
common configuration meaning it must be assigned to a VM whole."

Thanks

Eric
> 
> thanks
> -- PMM
> 

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