The Storage Performance Development Kit (SPDK) provides a set of tools and libraries for writing high performance, scalable, user-mode storage applications. It achieves high performance through the use of a number of key techniques:

  • Moving all of the necessary drivers into userspace, which avoids syscalls and enables zero-copy access from the application.
  • Polling hardware for completions instead of relying on interrupts, which lowers both total latency and latency variance.
  • Avoiding all locks in the I/O path, instead relying on message passing.

The bedrock of SPDK is a user space, polled-mode, asynchronous, lockless NVMe driver. This provides zero-copy, highly parallel access directly to an SSD from a user space application. The driver is written as a C library with a single public header.

SPDK further provides a full block stack as a user space library that performs many of the same operations as a block stack in an operating system. This includes unifying the interface between disparate storage devices, queueing to handle conditions such as out of memory or I/O hangs, and logical volume management.

Finally, SPDK provides NVMe-oF, iSCSI, and vhost servers built on top of these components that are capable of serving disks over the network or to other processes. The standard Linux kernel initiators for NVMe-oF and iSCSI interoperate with these targets, as well as QEMU with vhost. These servers can be up to an order of magnitude more CPU efficient than other implementations. These targets can be used as examples of how to implement a high performance storage target, or used as the basis for production deployments.

SPDK v20.01: Optimized thin provisioning, FTL bdev, VMD hot plug, FUSED support

Jan 30, 2020 • Tomasz Zawadzki

On behalf of the SPDK community I’m pleased to announce the release of SPDK 20.01!

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Announcing The 2020 US SPDK, PMDK and VTune Summit!

Jan 28, 2020 • John Kariuki

Save The Date

2020 Storage Performance Development Kit (SPDK), Persistent Memory Development Kit (PMDK) and Intel® Vtune Amplifier Summit
April 21st-22nd
Dolce Hayes Mansion, San Jose
200 Edenvale Ave, San Jose, CA 95136
http://www.hayesmansion.com

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19.10 SPDK SPDK NVMe-oF RDMA Performance Report

Jan 23, 2020 • Karol Latecki

New performance report for SPDK NVMe-oF RDMA has been published.

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