system to use an emulated nameless-writing device and show that doing so both reduces space and time overheads, thus making for simpler, less costly, and higher-performance SSD-based storage. 1

We present nameless writes, a new interface that obviates the need for indirection in modern solid-state storage devices (SSDs). Nameless writes allow the device to pick the location of a write and only then inform the client above of the decision. Doing so keeps control of block allocation

support for taint-based protection that is deployable in real-world situations, as emulation is only used when tainted data is being processed by the CPU. By modifying the CPU, memory, and I/O devices to support taint tracking and protection, we guarantee that data received from the network may

/O buses. Emulation increases latency, but very little. The degree depends on both device and operation, and varies from 2 microseconds for receiving small (60 byte) network packets up to 197 microseconds for writing 16KB to an ISA SCSI device. 1 Introduction We describe the design and performance of code

This paper addresses issues of mechanical emulation of stiff walls and stick-slip friction with a 6-DOF magnetically levitated joystick. In the case of stiff wall emulation, it is shown that the PD control implementation commonly used severely limits achievable wall damping and sti ness. It is also

present a novel approach to providing performance guarantees in this highly-volatile scenario, in an efficient and cost-effective way. Facade, a virtual store controller, sits between hosts and storage devices in the network, and throttles individual I/0 requests from multiple clients so that devices do

ii iv vTo my parents vi vii Acknowledgements I would first and foremost extend my whole-hearted gratitude to my advisors, An-drea Arpaci-Dusseau and Remzi Arpaci-Dusseau. Andrea and Remzi are the reason that I had the opportunity for this exceptional Ph.D. journey. To this day, I still re-member the moment when they took me as their student and the joy and hope in my heart. Andrea and Remzi have showed me what systems research is like and how much fun and challenging it can be. Before this journey with them, I had always liked and believed in the beauty of mathematics and theory. My initial interest in systems research happened when I took Remzi’s Advanced Operating Systems

new approach to fuzzing 802.11 device drivers on the basis of emulation. First, the process of creating a virtual 802.11 device for the processor emulator QEMU is described. Then, the development of a stateful 802.11 fuzzer based on the virtual device is discussed. Finally, we report the results

In this paper, the emulation environment named Hardware Discrete Channel Emulator (HDCE) has been developed as a coherent framework to emulate on a hardware device (FPGA as the implementation platform in the verification) and simulate on a computer the effect of an Additive White Gaussian Noise

emulation architecture for the evaluation of wireless communication software. By bridging the gap between simulation and wireless software using a custom device driver, our framework enables arbitrary and unmodified wireless communication software to be evaluated in a fully simulated network. In accordance