How many USB3 Cameras on a TX1?
Hi,
I have a probably trivial questions. I'm building a system with three Basler Cameras ( USB 3.0 , 1920 x 1200 , 40fps ) . Will this work on an Jetson Board TX1? Simultaneously?
Cheers!
Answers
Hi WeepingAngel,
TX1 supports the standard USB3 specs. The theoretical USB3.0 speed is 5Gbps(625MB), if there is no other type USB device(Bulk, interrupt) to share bandwidth, USB host can allocate 5Gbps * 90% = 562.5MB for iso transfer.
Here, when the 3 Basler Cameras can capture Images simultaneously - that will require ~ 474MB (3x 1920x1080 x 40fps x 2 B/pixel). Theoretically it should work.
Regards
Attention: In my experience no xHCI Host Controller has a performance that is quite near to the specs.
Good controllers provice bandwidth of about 450 MB/s, other controllers only 250-280 MB/s... don't know exactly the performance of an TX1 Jetson Board (i have only tested the older TK1). Also Ram Speed / Memory / Zero-Copy / Application implementation and other factors can limit the performance...
I don't think 3 Streams with 40fps will work without loosing frames (after some time)...perhaps 2 streams or 3 streams with 25fps...
Please have a look at some test measures: http://s.baslerweb.com/media/documents/USB3.0_Host_Controllers_Max_Bandwidth_rev10.pdf
Regards, Bjoern
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