Re: *** Compiler is too old
On Tue, Feb 22, 2022 at 7:19 PM Aruna Hewapathirane wrote: > > On Tue, Feb 22, 2022 at 8:48 PM Valdis Klētnieks > wrote: > > > > On Sun, 20 Feb 2022 23:52:47 -0500, Aruna Hewapathirane said: > > > > > *** Compiler is too old. > > > > > > What would be the sanest way to do this? Meaning upgrade gcc and friends ? > > > > Well... the answer to the posed question is, of course, "install gcc 5.1 or > > later" > > > I tried to do that believe me I jumped through lots of hoops but uh > uh no cigar.. :( > > > (and even *that* is pretty damned ancient - some of us are chasing problems > > with building the kernel with gcc 12. gcc 5.1 was released on 4-22-2015). > > > Show off, I had no idea there was a gcc 12 ( it is so good to hear > from you after many moons Valdis > how is the Jag and my warmest regards to miss drove a jag did not crash ? :) > > OK. Im picturing Valdis' beard in a top-down E-type I was just perusing this https://www.kernel.org/doc/html/latest/process/changes.html it speaks to minimum versions of everything Its good to next thru a bit, youll find things you didnt know. I dont need a PGP, but I know where to look for info now. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: USB CDC performance test
On Fri, 4 Mar 2022 at 20:31, Greg KH wrote: > On Fri, Mar 04, 2022 at 08:06:55PM +0530, Mithran B wrote: > > On Fri, 4 Mar 2022 at 19:48, Greg KH 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? Any hardware flow control mechanism there? How to enable this software flow control mechanism in kernel device drivers? Any other information related to this is good for us. -Thanks. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: USB CDC performance test
On Mon, Mar 07, 2022 at 01:08:28PM +0530, Mithran B wrote: > On Fri, 4 Mar 2022 at 20:31, Greg KH wrote: > > > On Fri, Mar 04, 2022 at 08:06:55PM +0530, Mithran B wrote: > > > On Fri, 4 Mar 2022 at 19:48, Greg KH 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 ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
