On Mon, 7 Mar 2022 at 13:20, Greg KH <g...@kroah.com> wrote: > On Mon, Mar 07, 2022 at 01:08:28PM +0530, Mithran B wrote: > > On Fri, 4 Mar 2022 at 20:31, Greg KH <g...@kroah.com> wrote: > > > > > On Fri, Mar 04, 2022 at 08:06:55PM +0530, Mithran B wrote: > > > > On Fri, 4 Mar 2022 at 19:48, Greg KH <g...@kroah.com> wrote: > > > > > > > > > On Fri, Mar 04, 2022 at 04:27:50PM +0530, Mithran B wrote: > > > > > > Hello, > > > > > > > > > > > > In Host and Gadget systems, enabled the USB CDC drivers. > > > > > > Then nodes are created as /dev/ttyAcm0 and /dev/ttyGs0. > > > > > > Then opened the nodes and write and read back the data. > > > > > > It is working. > > > > > > > > > > > > I want to test the performance of this interface and drivers. > > > > > > Do we have any utility for this? > > > > > > How to do the performance test? > > > > > > > > > > What exactly do you want to measure? Determine that first before > > > trying > > > > > to find a test for that. Without knowing what you want to measure, > > > it's > > > > > hard to tell you how to measure it :) > > > > > > > > > > good luck! > > > > > > > > > > greg k-h > > > > > > > > > > > > > Thank you. > > > > I want to send the data at the rate of 5mbps from Host device to > target > > > > device using USB CDC - ACM. > > > > In termios functions, how to configure this 5mbps as baud rate and > USB > > > > payload size, i.e. packet > > > > size to be in 2K bytes. > > > > > > There is no "baud rate" for usb cdc devices, really, as you have tried > > > this already, right? > > > > > > Just send the data as fast as you can, with the largest chunks of data > > > that you have (do not send it byte by byte to the kernel), and you > > > should be fine. > > > > > > Are you sure that your device can handle that type of data rate? > That's > > > almost always the limiting factor. > > > > > > good luck! > > > > > > greg k-h > > > > > > > In USB CDC, any software flow control mechanism is implemented? > > The specification is public on the usb.org web site, if you are curious. > There is no need for "flow control" like you are used to for older > serial connections with USB, the way USB works handles it automatically > (the host drives the connection, if the device is full, it tells the > host to wait automatically). > > > Any hardware flow control mechanism there? > > Other than the normal USB flow control mechanism? No, why would there > be? > > > How to enable this software flow control mechanism in kernel device > drivers? > > what software flow control? > > > Any other information related to this is good for us. > > For whom? What exactly have you tried and what were the results? > > thanks, > > greg k-h >
Thank you. I got the details.
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