PASTE: A Network Programming Interface for Non-Volatile Main Memory


Michio Honda, NEC Laboratories Europe; Giuseppe Lettieri, Università di Pisa; Lars Eggert and Douglas Santry, NetApp


Non-Volatile Main Memory (NVMM) devices have been integrated into general-purpose operating systems through familiar file-based interfaces, providing efficient bytegranularity access by bypassing page caches. To leverage the unique advantages of these high-performance media, the storage stack is migrating from the kernel into user-space. However, application performance remains fundamentally limited unless network stacks explicitly integrate these new storage media and follow the migration of storage stacks into user-space. Moreover, we argue that the storage and the network stacks must be considered together when being designed for NVMM. This requires a thoroughly new network stack design, including low-level buffer management and APIs.

We propose PASTE, a new network programming interface for NVMM. It supports familiar abstractions—including busy-polling, blocking, protection, and run-to-completion—with standard network protocols such as TCP and UDP. By operating directly on NVMM, it can be closely integrated with the persistence layer of applications. Once data is DMA’ed from a network interface card to host memory (NVMM), it never needs to be copied again—even for persistence. We demonstrate the general applicability of PASTE by implementing two popular persistent data structures: a write-ahead log and a B+ tree. We further apply PASTE to three applications: Redis, a popular persistent key-value store, pKVS, our HTTP-based key value store and the logging component of a software switch, demonstrating that PASTE not only accelerates networked storage but also enables conventional networking functions to support new features.

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@inproceedings {211259,
author = {Michio Honda and Giuseppe Lettieri and Lars Eggert and Douglas Santry},
title = {{PASTE}: A Network Programming Interface for {Non-Volatile} Main Memory},
booktitle = {15th USENIX Symposium on Networked Systems Design and Implementation (NSDI 18)},
year = {2018},
isbn = {978-1-939133-01-4},
address = {Renton, WA},
pages = {17--33},
url = {},
publisher = {USENIX Association},
month = apr

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