On Nov 19, 2013, at 5:45 PM, Vincent JARDIN wrote: > (off list since it coul become a troll ;) ) > > At 6WIND, we developed a librte_crypto as a generic framework to manage any crypto framework: > - Intel's QuickAssist > - Cavium' Nitrox II > - AES/NI SW crypto > > it was required in order to manage high rate of PCI IOs for Cryptos (IPsec, SSL, etc...) > > So, after the librte_pmd_mlx4, Virtio, Vmxnet3, that's more than 6 ultra low latency/very efficient drivers that we added into the DPDK and promoted. > > Which storage drivers would you foresee first to be run in userland? > > Best regards, > > > On 19/11/2013 02:22, March Jane wrote: >> >> — Nowadays dilemmas in enterprise-class storage system & motivation -- >> >> The model of most storage system is ‘Front-end cards + CPU + back-end magnetic media hard drive’, in such system, the hard drive is very slow in terms of its capability in random accessing - roughly 200IO per second, in contrast, the processor is very fast, therefore many software stack can tolerate waste of CPU cycle for exploiting capabilities of hard drive. >> >> In addition, regularly software for SAN is developed under kernel space in order to achieve low latency - few milliseconds per request, and IO pressure in scenario of heavy workload. Usually software in user-space with POSIX is slow. However kernel-space developing is nightmare for engineers, even we have approaches to simulate these code under user-space. >> >> However, so far flash is coming to popular, the gap between CPU and media is overturned, a single flash card can be easy to reach 1M iops, if plug 10 such cards inside a server, the processor is hard to back. Thus, today’s challenge in flash storage is to exploit the capability of processor, ironically. In addition to this purpose, move to user-space is also a motivation, if move to user-space is OS-bypass rather than moving to POSIX. >> >> >> Best >> >> - March >> >> >>