[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH V6 3/7] libxl: add pvusb API
Most of what you say is right, I think, but: Ian Campbell writes ("Re: [Xen-devel] [PATCH V6 3/7] libxl: add pvusb API"): > On Fri, 2015-09-11 at 16:18 +0200, Juergen Gross wrote: > > In theory I think up to 7 cascaded > > hubs are possible, but I don't think the resulting theoretical maximum > > of about 1 trillion devices on a bus is to be considered. :-) > > And this suggests that in principal a Linux hostbus could be 5*7 bits == 35 > bits, maybe. Or at least that any USB address can be encoded in that many > bits. No. The total possible number of `buses' in that sense per root is: 1 root + 31 in theory a hub plugged into each of 31 ports + 31^2 in theory a hub plugged into each port ... + 31^6 You could plug hubs into the last layer but the maximum depth is 7 so you wouldn't be able to plug any devices into that last hub. And of course the number of root hubs is not really limited by anything meaningful. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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