%0 Journal Article %1 4155314 %A Calandrino, J.M. %A Baumberger, D. %A Li, Tong %A Hahn, S. %A Anderson, J.H. %D 2007 %J Real Time and Embedded Technology and Applications Symposium, 2007. RTAS '07. 13th IEEE %K Heterogeneous heterogeneous multicore os-scheduling real-time scheduling %P 101-112 %R 10.1109/RTAS.2007.35 %T Soft Real-Time Scheduling on Performance Asymmetric Multicore Platforms %X This paper discusses an approach for supporting soft real-time periodic tasks in Linux on performance asymmetric multicore platforms (AMPs). Such architectures consist of a large number of processing units on one or several chips, where each processing unit is capable of executing the same instruction set at a different performance level. We discuss deficiencies of Linux in supporting periodic real-time tasks, particularly when cores are asymmetric, and how such deficiencies were overcome. We also investigate how to provide good performance for non-real-time tasks in the presence of a real-time workload. We show that this can be done by using deferrable servers to explicitly reserve a share of each core for non-real-time tasks. This allows non-real-time tasks to have priority over real-time tasks when doing so will not cause timing requirements to be violated, thus improving non-real-time response times. Experiments show that even small deferrable servers can have a dramatic impact on non-real-time task performance

@article{4155314, abstract = {This paper discusses an approach for supporting soft real-time periodic tasks in Linux on performance asymmetric multicore platforms (AMPs). Such architectures consist of a large number of processing units on one or several chips, where each processing unit is capable of executing the same instruction set at a different performance level. We discuss deficiencies of Linux in supporting periodic real-time tasks, particularly when cores are asymmetric, and how such deficiencies were overcome. We also investigate how to provide good performance for non-real-time tasks in the presence of a real-time workload. We show that this can be done by using deferrable servers to explicitly reserve a share of each core for non-real-time tasks. This allows non-real-time tasks to have priority over real-time tasks when doing so will not cause timing requirements to be violated, thus improving non-real-time response times. Experiments show that even small deferrable servers can have a dramatic impact on non-real-time task performance}, added-at = {2008-10-20T21:54:42.000+0200}, author = {Calandrino, J.M. and Baumberger, D. and Li, Tong and Hahn, S. and Anderson, J.H.}, biburl = {https://www.bibsonomy.org/bibtex/2c186d09667e8be06fc2180d6a20d34e9/ykwok}, doi = {10.1109/RTAS.2007.35}, interhash = {970b059d7e89a548e1de177926f074aa}, intrahash = {c186d09667e8be06fc2180d6a20d34e9}, issn = {1080-1812}, journal = {Real Time and Embedded Technology and Applications Symposium, 2007. RTAS '07. 13th IEEE}, keywords = {Heterogeneous heterogeneous multicore os-scheduling real-time scheduling}, month = {April}, pages = {101-112}, timestamp = {2008-10-20T21:54:42.000+0200}, title = {Soft Real-Time Scheduling on Performance Asymmetric Multicore Platforms}, year = 2007 }