Update – 26 Nov 2015 – Well things can move very fast in the Linux world when they want to! Since I wrote this article an improved, but still pre-production, version of the polling code for the block layer and NVMe driver have made it into the Linux kernel and will go mainline in 4.4. There is a really nice overview of how it works here and Jens’ patch-set comments and some of his testing results can be found here. It is worth stressing that the results we present should only improve as the polling mode evolves. Stay tuned for updated performance results in due course!
I love SSDs! They have transformed the data center by providing high-performance, low latency access to storage. Low latency is transforming the data center stack. I will be digging into latency in my next few blog posts, starting with Driver latency here.