Hermann H artig, Michael Hohmuth, and Jean Wolter. Taming Linux. In Proceedings of the 5th Annual Australasian Conference on Parallel And Real-Time Systems (PART '98), Adelaide, Australia, September 1998.  Home/Search   Document Not in Database   Summary   Related Articles   Check

.... been successfully performed by two other projects: The RT Linux Project of the University of New Mexico uses a small kernel to provide real time processes in parallel to the Linux operating system [6] Also the DROPS project , which uses the L4 Fiasco kernel and an adapted L4 Linux [27] [20] provides real time processes. Based on a predecessor of the L4 kernel, L3, a persistent environment is realized providing separated mutual protected DOS clients [26] This approach is taken up in Section 4.5.2.1. 1.3 Limits To develop the entire PERSEUS project a lot of man years are ....

Hermann Hrtig, Michael Hohmuth, and Jean Wolter. Taming Linux. Technical report, Dresden University of Technology, Dept. of Computer Science, 1998.

.... it was decided that a microkernel 97, BH70] would be the most suitable operating system base, allowing systems from hard real time executives to general purpose time sharing systems to be implemented on top of it, with the option for concurrently running other operating system personalities [HHW98] The biggest concern in using a microkernel base was the poor performance displayed by rst generation microkernels [CB93, Lie96d] The L4 microkernel [Lie95b, Lie96a, AH98] presented itself as an ideal choice not only due to its high performance implementations, but since the research group ....

Hermann Hartig, Michael Hohmuth, and Jean Wolter. Taming linux. In Proceedings of the PART '98, 1998.

No context found.

Hermann H artig, Michael Hohmuth, and Jean Wolter. Taming Linux. In Proceedings of the 5th Annual Australasian Conference on Parallel And Real-Time Systems (PART '98), Adelaide, Australia, September 1998.

....memory. The main abstractions are threads and data spaces. An important property of the basic resource 2 management is that it is a resource manager with the ability of mandatory and optional reservation. More details and a list of conference publication on DROPS are available on our Web Pages. [5, 3, 4, 8, 7, 6] 2.2 Security Architecture For a platform with much stricter security requirements, the DROPS architecture is not sufficient. Rather, a careful implementation of a small secure platform (to avoid the infected term of a trusted computing base) is needed that enforces separation of secure and ....

Hermann Hartig, Michael Hohmuth, and Jean Wolter. Taming Linux. In Proceedings of the 5th Annual Australasian Conference on Parallel And Real-Time Systems (PART '98), Adelaide, Australia, September 1998.

....standard, unmodified Linux programs (binary compatibility) The Linux server never disables interrupts for synchronization purposes. Instead, we modified the implementations of cli( and sti( to work without disabling interrupts while still ensuring their semantics (to protect a critical section) [4]. 2.2 L4RTL implementation We implemented L4RTL as a library for RTLinux application programs and a dynamic load module for L 4 Linux. Figure 1 gives an overview of L4RTL s structure. Linux app Linux User Kernel app Fiasco microkernel L Linux server L4RTL library L4RTL library 4 ....

Hermann Hartig, Michael Hohmuth, and Jean Wolter. Taming Linux. In Proceedings of the 5th Annual Australasian Conference on Parallel And Real-Time Systems (PART '98), Adelaide, Australia, September 1998.

....The exception handler calls the Linux server process using IPC. Interrupts are mapped to IPC to top halves of device drivers running as threads. Driver threads are subject to standard L4 scheduling. Synchronisation of critical regions is done explicitly rather than by disabling interrupts [10]. Memory resources are divided between the L 4 Linux subsystem and the real time side. To measure the effect of running Linux as a user level process and using explicit syncronisation we used the commercial AIM Multiuser Benchmark Suite VII. It uses Load Mix Modeling to test how well multiuser ....

....with L 4 Linux we found a missing wakeup in our low level interrupt handler leading to unnecessary idle times within the system. After fixing the bug the performance penalty went down to 2 4 . Tamed Linux reduces worst case interrupt latencies to about 20 s on the Intel architecture [10]. 4.2 ATM Subsystem A prime example of a DROPS component is its native ATM protocol implementation. While ATM has been developed with strong emphasis on deterministic high speed communication, current operating systems and networking protocols cannot yet fully utilize its potential. The DROPS ....

[Article contains additional citation context not shown here]

Hermann Hartig, Michael Hohmuth, and Jean Wolter. Taming linux. In Proceedings of the 5th Annual Australasian Conference on Parallel And Real-Time Systems (PART '98), Adelaide, Australia, September 1998.

....This has lost us a number of interesting industry and research partnerships. Real time properties. L4 x86 uses interrupt disabling as its sole kernel synchronization scheme. Under certain circumstances, this can lead to interrupts being disabled for time intervals which are unacceptably long. [6] These problems make the L4 x86 unsuitable as a base for the DROPS operating system. Also, it would be desirable to use the kernel in education, but the first two problems make this impossible. 1.2 The Solution The L4 x86 kernel shall be replaced with a new implementation of the L4 interface ....

Hermann Hartig, Michael Hohmuth, and Jean Wolter. Taming Linux. In Proceedings of the 5th Annual Australasian Conference on Parallel And Real-Time Systems (PART '98), Adelaide, Australia, September 1998.

No context found.

Hermann H artig, Michael Hohmuth, and Jean Wolter. Taming Linux. In Proceedings of the 5th Annual Australasian Conference on Parallel And Real-Time Systems (PART '98), Adelaide, Australia, September 1998.

Online articles have much greater impact   More about CiteSeer.IST   Add search form to your site   Submit documents   Feedback  

CiteSeer.IST - Copyright Penn State and NEC