UTLB: a mechanism for address translation on network interfaces
Proceedings of the eighth international conference on Architectural support for programming languages and operating systems
Shared memory computing on clusters with symmetric multiprocessors and system area networks
ACM Transactions on Computer Systems (TOCS)
Design Trade-Offs for User-Level I/O Architectures
IEEE Transactions on Computers
Scaling MPI to short-memory MPPs such as BG/L
Proceedings of the 20th annual international conference on Supercomputing
Porting a user-level communication architecture to NT: experiences and performance
WINSYM'99 Proceedings of the 3rd conference on USENIX Windows NT Symposium - Volume 3
HybridOS: runtime support for reconfigurable accelerators
Proceedings of the 16th international ACM/SIGDA symposium on Field programmable gate arrays
RDMA in the SiCortex cluster systems
PVM/MPI'07 Proceedings of the 14th European conference on Recent Advances in Parallel Virtual Machine and Message Passing Interface
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User-level network interfaces allow applications direct access to the network without operating system intervention on every send and receive. Messages are transferred directly to and from user-space by the network interface while observing the traditional protection boundaries between processes. Current user-level network interfaces limit this message transfer to a per-process region of permanently-pinned physical memory to allow safe DMA. This approach is inflexible in that it requires data to be copied into and out of this memory region, and does not scale to a large number of processes. This paper presents an extension to the U-Net user-level network architecture (U-Net/MM) allowing messages to be transferred directly to and from any part of an application''s address space. This is achieved by integrating a translation look-aside buffer into the network interface and coordinating its operation with the operating system''s virtual memory subsystem. This mechanism allows network buffer pages to be pinned and unpinned dynamically. Two implementations of U-Net/MM are described, demonstrating that existing commodity hardware and commercial operating systems can efficiently support the architecture.