An NVMe-based Offload Engine for Storage Acceleration Sean Gibb, Eideticom Stephen Bates, Raithlin
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1 An NVMe-based Offload Engine for Storage Acceleration Sean Gibb, Eideticom Stephen Bates, Raithlin 1
2 Overview Acceleration for Storage NVMe for Acceleration How are we using (abusing ;-)) NVMe to support acceleration? Embedded NVMe Controller RISC-V on FPGA Performance Fabrics, Peer-to-Peer, and CMB 2
3 Acceleration PCIe Bus NVMe SSD NVMe SSD Host CPU HDD RDMA NIC NoLoad Accel. Card TM Storage I/O bandwidth increasing rapidly Storage workloads can be taxing on host CPU Hyperconverged storage exacerbates the problem Reconfigurable logic can provide compelling solution for storage workloads 3
4 Acceleration Over NVMe Using NVMe host controller interface to provide data and control to accelerator functions No need for proprietary drivers Avoid driver development and take advantage of improvements in NVMe standard, drivers and tools Leverage industry-standard NVMe test tools Assist with deployment and benchmarking Test tools, software and ecosystem Can tie into NVMe over Fabrics Can leverage inbox drivers in all modern OS Can leverage servers and storage systems developed for NVMe 4
5 Basic Architecture Host CPU PCIe Controller and DMA Engine NVMe Controller Accelerators FPGA Bus DDR DDR Controller DDR TM NoLoad Accelerator Board PCIe Presents as an NVMe 1.2 device with multiple namespaces Host CPU communicates with accelerators via NVMe commands to NVMe controller NVMe controller pulls commands and data via DMA engine Accelerators easily integrated on an internal bus Accelerators are mapped to NVMe namespaces to enable discovery and command and data routing 5
6 Acceleration Over NVMe Commands Identify Namespace is used for accelerator discovery Vendor specific field used to provide accelerator specific information Write is used to provide data to accelerators Read is used to retrieve results from accelerators Writing and reading from specific namespace to communicate with specific accelerator Vendor specific commands available for accelerator specific control 6
7 Embedded NVMe Controller For flexibility developed an embedded controller Faster turnaround on compliance debugging Quickly implement new features Downside is that getting performance from an embedded controller on FPGA is more difficult Requires coprocessors and offload 7
8 Processor Selection Which processor to use for controller? Requirements Platform agnostic Broad software ecosystem Soft Requirements Extensible instruction set 32-bit and 64-bit addressing available 8
9 RISC-V RISC-V is an instruction set architecture Gaining momentum in academia and industry Originally developed in 2010 at UC Berkeley Several commercial and open-source processor implementations available Can be autogenerated using open-source toolchain Meets our hard and soft requirements with a few caveats 9
10 RISC-V Software Ecosystem RISC-V includes software support for: GCC toolchain with GDB support LLVM toolchain Spike simulator QEMU model Includes OS support for GNU/Linux, FreeBSD, and NetBSD 10
11 RISC-V Core Original plan was to use Rocket core generator Rocket designs are best suited to ASIC Only achieved 50MHz on FPGA Alternative was to start from ORCA BSD license FPGA-optimized RISC-V CPU Using 32-bit instruction set to reduce size Original design achieved 125MHz 11
12 Development Process Wrote software for our controller and replaced NVMe QEMU model to verify functionality Ported to RISC-V Porting DMA accounted for 90% of effort Verified controller against Linux and Windows drivers with a backing RAM drive Performance testing for the RAM drive 12
13 Test Setup Intel i PLX9797 PCIe switch Eideticom NoLoad Accelerator targeted to Xilinx XCVU095 Ultrascale PCIe Gen3x8 2 x 2.5GB DDR4 Samsung 960 EVO 250GB M.2 SSD Intel SSDPEKKW256G7 256GB M.2 SSD Viavi PCIe Capture Card 13
14 FIO Performance Throughput (GB/s) FIO Throughput by Block Size FIO Block Size (KB) Read FIO Write FIO DMA Performance Big block transfers saturate PCIe Gen3x8 throughput Small block transfers require further work by adding more RISC-V cores and command processing offload engines Capable of saturating PCIe Gen3x8 with current DMA engine for most block sizes Verified with PCIe capture card that we are saturating PCIe bandwidth 14
15 Latency Latency (usec) Read Latency by Block Size Block Size (KB) NVMe latency is largely due to software path Accelerator use model will tend to focus more on throughput than latency Future improvements in NVMe command processing will improve latency 15
16 RISC-V Complications No external debugger for RISC-V yet Difficult to track down bugs in embedded system without external debugger Built our own internal primitive debugger Trade-offs between code size and clock rate in FPGA design are persistent Instruction bubbles in the processor were slowing us down Fixing ORCA implementation improved performance Turned up and fixed several ORCA bugs during this process Managed to get ORCA to 190MHz on FPGA Built DMA offload to handle data transfers and Completion commands Underbaked or missing features in ORCA 16
17 Error Correction Accelerator Built an RS(32, 4) EC accelerator ISA-L compatible Utilizes 16KB block sizes Saturates PCIe Gen3x8 throughput (i.e. 8GB/s) Modified ISA-L perf test in less than an hour to use NoLoad NVMe Accelerator Using our host side API software integrates into host software with 10 lines of code Roadmap includes PCIe Gen3x16 (PCIe Gen4x8) dual namespace version capable of 16GB/s 17
18 Peer-to-Peer CMB Host CPU Added full CMB support to accelerator Send NVMe Write Completion NVMe Write Command with CMB source NVMe Drive Storage CMB NoLoad Send NVMe Read Completion NVMe Read issued with destination in CMB NVMe Drive Took 1 day thanks to software controller With data CMB only one external DMA is required Removes load on host CPU for memcpy Internal DMA from CMB to Storage PCIe memory write to CMB 18
19 Peer-to-Peer CMB (Staging Buffer) Send NVMe Write Completion NVMe Write Command with CMB source NVMe Drive Host CPU Storage CMB NoLoad PCIe memory read from CMB Send NVMe Read Completion NVMe Read issued with destination in CMB NVMe Drive PCIe memory write to CMB Added full CMB support to accelerator Took 1 day thanks to software controller With data CMB only one external DMA is required Removes load on host CPU for memcpy CMB can be used as a staging buffer between two devices that do not support CMB 19
20 Peer-to-Peer CMB Results Throughput (MB/s) Peer-to-Peer Testing with CMB vs System Memory Current setup saturates due to insufficient sources in the test environment Block Size (KB) Via CMB Via System Memory 20
21 Peer-to-Peer with CMB as Staging Buffer Throughput (MB/s) Peer-to-Peer Staging Buffer CMB vs System Memory Block Size (KB) Our test setup has insufficient sources to demonstrate expected maximum performance via CMB via System Memory 21
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