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Updated: Dec 27, 2025

Mass Spectrometric Approaches to Study Protein Structure and Interactions in Lyophilized Powders

Mass Spectrometric Approaches to Study Protein Structure and Interactions in Lyophilized Powders

Published on: April 14, 2015

HMB in DRAM-less NVMe SSDs: Their usage and effects on performance.

Kyusik Kim¹, Taeseok Kim²

¹Department of Computer Engineering, Kwangwoon University, Nowon-gu, Seoul, Republic of Korea.

|March 3, 2020

Summary

This summary is machine-generated.

DRAM-less SSDs are cheaper but slower. The host memory buffer (HMB) feature significantly improves their performance by using the host computer's memory, primarily as an address mapping table cache.

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Last Updated: Dec 27, 2025

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Area of Science:

Computer Engineering
Storage Technology
Performance Optimization

Background:

DRAM-less Solid-State Drives (SSDs) are increasingly popular in client and embedded markets due to lower cost and power consumption.
These drives traditionally exhibit lower performance compared to SSDs with internal DRAM due to the absence of a dedicated memory cache.
The Non-Volatile Memory Express (NVMe) protocol introduced the Host Memory Buffer (HMB) feature to mitigate this performance gap.

Purpose of the Study:

To evaluate the performance impact of the HMB feature on commercial DRAM-less SSDs.
To investigate and reveal the specific mechanisms by which HMB improves I/O performance in these devices.
To compare the effectiveness of HMB against traditional DRAM caching strategies.

Main Methods:

Performance benchmarking of commercial DRAM-less SSDs with and without HMB enabled.
Comparative analysis against SSDs equipped with internal DRAM.
Experimental methods designed to identify the functional role of the host memory buffer (e.g., read cache, write buffer, address mapping table cache).

Main Results:

Commercial DRAM-less SSDs demonstrate significantly lower I/O performance than SSDs with internal DRAM.
The utilization of the HMB feature demonstrably improves the I/O performance of DRAM-less SSDs.
Experimental findings indicate that HMB is primarily employed as an address mapping table cache.

Conclusions:

DRAM-less SSDs can achieve improved performance through the NVMe HMB feature, leveraging host system memory.
The primary benefit of HMB in the evaluated DRAM-less SSDs stems from its function as an address mapping table cache.
HMB serves as a cost-effective solution to enhance the performance of budget-oriented SSDs without internal DRAM.