Hi I have more than twice as much cpu load when running the CONFIG_PREEMPT_RT_FULL=y kernel compared to CONFIG_PREEMPT_RTB=y. First i thought that might be the difference that one config had softirqs enabled and the other not. Now i realized that softirqs are already enabled with CONFIG_PREEMPT_RTB so i don't see a good reason why the CONFIG_PREEMPT_RT_FULL option should have two times more cpu load than CONFIG_PREEMPT_RTB. The arm1136 cpu (533Mhz pcm043) has 9.6khz interrupt rate so i surely expect some load. But i wouldn't expect so much difference between CONFIG_PREEMPT_RT_FULL and CONFIG_PREEMPT_RTB. So does anybody has an idea what might a reason to so much more cpu load when going to full preemption? Besides of the cpu load i also found out that with rt11 i can again wake up usermode from a IRQF_NO_THREAD waiting on a waitqueue. So the steps outlined in this mail http://www.spinics.net/lists/linux-rt-users/msg06834.html do not seem to be neccessary anymore? Or does this create an error and than some high load? Best regards Tim Hottinger Baldwin Messtechnik GmbH, Im Tiefen See 45, 64293 Darmstadt, Germany | www.hbm.com Registered as GmbH (German limited liability corporation) in the commercial register at the local court of Darmstadt, HRB 1147 Company domiciled in Darmstadt | CEO: Andreas Huellhorst | Chairman of the board: James Charles Webster Als Gesellschaft mit beschraenkter Haftung eingetragen im Handelsregister des Amtsgerichts Darmstadt unter HRB 1147 Sitz der Gesellschaft: Darmstadt | Geschaeftsfuehrung: Andreas Huellhorst | Aufsichtsratsvorsitzender: James Charles Webster The information in this email is confidential. It is intended solely for the addressee. If you are not the intended recipient, please let me know and delete this email. Die in dieser E-Mail enthaltene Information ist vertraulich und lediglich fur den Empfaenger bestimmt. Sollten Sie nicht der eigentliche Empfaenger sein, informieren Sie mich bitte kurz und loeschen diese E-Mail. -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
