Re: [Xen-devel] VT-d async invalidation for Device-TLB.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.06.15 at 05:55, <quan.xu@xxxxxxxxx> wrote:
>>  From: Zhang, Yang wrote on June 16, 2015 11:07 AM
>>> Jan Beulich wrote on 2015-06-15:
>> >>>> On 13.06.15 at 16:44, <quan.xu@xxxxxxxxx> wrote:
>> >>> On 12.06.15 at 14:47, <JBeulich@xxxxxxxx> wrote:
>> >>>>>> On 12.06.15 at 04:40, <quan.xu@xxxxxxxxx> wrote:
>> >>>> I tested it by a Myri-10G Dual-Protocol NIC, which is an ATS device.
>> >>>> for an invalidation:
>> >>>>  By sync way, it takes about 1.4 ms.
>> >>>>  By async way, it takes about 4.3 ms.
>> 
>> It is a typo for the time: should be 1.4 us and 4.3 us.
>> 
> 
> yes, it is 1.4 us and 4.3 us.
> Thanks.
> 
> I also have tested iotlb sync and async invalidation.
> For sync way: it takes about 3.2 us.
> For async way: it takes about 5.3 us.

That's _longer_ than in the ATS case. Is that realistic?

Jan


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