On Mon, Dec 5, 2016 at 4:35 PM, Greg KH <[email protected]> wrote: > On Mon, Dec 05, 2016 at 04:24:05PM +0200, Ran Shalit wrote: > > Hello, > > > > We need to support serial driver with real time requirements (towards > specific > > device with RT demands): > > Every 5.3msec receive 100 bytes and 1.3msec afterwards send 100 bytes. > > > > 1. Does kernel support real-time of such hard requirements ? > > It depends on the hardware you are using, does your hardware provide > enough processing power and lack of harware interruptions (i.e. SMI) to > allow this to work properly? > > > 2. Is it matter if we do the exact bytes send/receive from kernel or > userspace, > > i.e. is kernel more real-time than userspace ? > > It depends on your userspace code, people write real-time Java code in > userspace just fine. > > > 3. Is mainline kernel unable to support such requirements and we better > use RT > > patch such as xemonai ? > > Why not try it out yourself and see? You have the code and the hardware > to test, you don't need us to tell you if this works or not :) >
Hi, I mean that the requirements doesn't allow missing of these time intervals for send/receive. Say If I'll test and it shall work OK, does it mean that in a more loaded usage (more threads in a future application), it shall still function correctly with the same kernel (from mainline) ? I also wanted to ask if it is doing real-time in kernel is better than doing it in userspace ? Since we have some doubts if kernel can support such hard requirements, I raised this question. I know that Xenomai was created to make kernel hard real-time. Thank you for any feedback. Ran > > good luck! > > greg k-h >
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