Hi, > > The PREEMPT_RT uses mutexes for "normal" spin locks that do not > disable interrupts... > I'll try to use raw spinlocks in this code section and for the tty flip buffer > See if that can solve my problem. > > If you have other ideas... let me know! > > Regards, > Ivo I've changed some small things to the tty layer (see my other 3 RFC patches I've send). Performance increased with my loopback stress test: - Old situation: average read call last for 50us, with peaks up to 230 us - New situation: average read call still 50us, peak up to 60 us - Write was stable in both situations: average of 90 us, peak up to 100 us Only the very first read & write took extra time (128 us for read, 143 for write) I'm still investigating that... Feedback is very appreciated. Regards, Ivo Sieben -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
