Accelerating data transfer and pushing CPU and DDR bus efficiency to the extreme is a good data center architecture evaluation standard. Recently, PMC combined its NVRAM technology with high-speed network card company Mellanox to demonstrate the high-speed transmission examples of NVMe over RDMA and P2P, effectively freeing CPU and DDR bus resources, and significantly improving data transmission speed. The joint demonstration consists of two parts, first showing how NVMe and RDMA can be combined to provide low-latency, high-performance, block-based NVM access on a large scale at the remote end. The second part of the demo integrates Mellanox's RDMA peer-initiated operation with PMC's Flashtec NVRAM accelerator card, using memory-mapped I/O (MMIO) as an RDMA target for remote, massively persistent memory. access. The following will be introduced in detail one by one:
NVM Express over RDMANVMe over RDMA (NoR) demonstrates the potential for extending the NVMe protocol beyond RDMA. A total of two computers were used in the demonstration, one as a client and the other as a server with a Mellanox ConnectX-3 Pro NIC connected via RoCEv2. The NVMe device used in the demonstration is a very high performance and very low latency PMC Flashtec NVRAM accelerator card. The figure below is a block diagram of the demonstration.
This demonstration shows that using RDMA to transfer NVMe commands and data results in minimal additional latency without affecting throughput.
Comparing the average latency of the local NVMe device with the remote NVMe device, as shown in the following table, the delay increase in the NoR scheme is less than 10 microseconds.
The other set of data compares the test results of the local NVMe device and the remote NVMe device throughput. As can be seen from the table below, there is no reduction in throughput in the NoR scheme.
In this demonstration, the remote client is directly connected to a server's NVRAM/NVMe device by adding the server CPU and DRAM offload on top of the standard RDMA. We combined the RoCEv2-capable ConnectX-3 Pro RDMA NIC from Mellanox with PMC's Flashtec NVRAM accelerator card to enable peer-to-peer operation between the NIC and NVRAM. The peer initiated operation can achieve direct access to the NVRAM accelerator card by the remote client. Compared with the traditional RDMA process, the delay can be reduced and the CPU and DRAM resources can be effectively released.
Again, the two computers used in the demo, one as a client and the other as a server. The performance of the peer-initiated operation can be greatly improved by using the PCIe switching device in the server.
Comparing the background DRAM bandwidth available on the server with traditional RDMA and peer-initiated RDMA, the data obtained by perftest is as follows:
The following table compares the average latency when using traditional RDMA and peer-initiated RDMA. The result is derived from RDMA mode of fio:
Both RDMA and NVMe technologies are in a booming phase. RDMA provides long-distance, large-scale low-latency and high-efficiency data movement, while NVMe provides low-latency access to SSDs. Combine the two technologies to achieve extraordinary performance.
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