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

["Xu, Quan" <quan.xu@xxxxxxxxx>]

> June 16, 2015 3:57 PM <JBeulich@xxxxxxxx> wrote:
> >>> 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


1.4 us and 4.3 us are average values of context/iotlb sync and asyc for a large 
sample of data.

3.2 us and 5.3 us are average values of iotlb for a small sample of data.

Quan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel