On Wed, 18 16:58 , Peter Stuge wrote: > > Why do you want to do this again? You mentioned bus bandwidth. > How would you like to use the bandwidth knowledge?
Short answer: Because it helps to sort out data-rate problems that might occur due to several high-bandwidth devices sharing a single bus for USB 3.0. Long answer: In the not-too-distant future some devices will appear on the market that will use the bandwidth that USB 3.0 provides. In fact, industrial cameras only adapt USB 3.0 because of its bandwidth superiority to Gigabit Ethernet. But the 400 MB/s will also be interesting for hard disks and the like. Now imagine you wonder why your device only transmits data with an unsatisfying rate. The first thing I'd do is checking if the device can use the full bus bandwidth, i.e. if there are some other devices on the same bus. The only way to get a clue about this is looking how many devices are attached to a certain host controller. In case of a PCIe card, this is easy because I can distinguish the ports belonging to a card. This is difficult at least if the HC chip is onboard and ports from different HCs are placed on the rear of a PC. Let alone a 19" device, where eyeballing might not be possible at all in the short term. However, this would be more easily solved in software, if there is a way to retrieve which device are on a common bus. It will also be helpful to know the manufacturer and model of a HC in those cases. Regards, /Markus ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
