Hi, On Tue, Dec 02, 2014 at 11:55:29AM +0100, Ricardo Ribalda Delgado wrote: > Hello > > As you know I am trying to improve the net2280 driver to a point where > it is usable for my company (qtec.com). We develop smart cameras based > on linux, and we want to provide also a mass storage interface to the > camera. > > Right now, the maximum speed I have been able to achieve is around 80 > MiB per second. This is with the governor in performance mode and > disabling idle states on the cpu. > > I wonder if any of you have meassured the maximum speed achievable via > usb gadget mass storage via usb 3.0? I got more than 100MiB/sec and I know Paul Zimmerman got 350MiB/sec using a different host side stack. Both of these numbers were achieved using dwc3 (drivers/usb/dwc3). > And what about the fastest usb 3.0 ssd hard drive (no usb gadget)? > > If I want to get closer to the maximum speed should I just forget > about mass storage and use something else? What? not forget, but sniff. Get yourself a USB 3.0 bus analyzer and look at the bus, why are you getting impacted so badly ? too many SOFs ? Also, you might want to let g_mass_storage use 4 buffers (or maybe more) of 128KiB. Another option is to try the UASP gadget which Sebastian Siewior wrote. That's a much better approach and also supports BOT. Sebastian, do you still have any notes on how to use UASP gadget with either RAM or a real storage backend ? cheers -- balbi
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