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Uploaded on May 5, 2009
AsiaBSDCon 2009: As more and more services on the internet become cryptographically secured, the load of cryptography on systems becomes heavier and heavier. Many of the embedded communications processors supported by FreeBSD provide acceleration for cryptographic operations in silicon and various manufacturers build hardware for accelerating secure web traffic and IPSEC VPN tunnels. In the FreeBSD kernel, acceleration hardware is supported by the opencrypto framework. This paper presents an overview of the framework and explains the advantages and pitfalls of using hardware acceleration on various workloads and system configurations.