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Bcache Testing: Throughput

Aug 26, 2010, 21:35 (0 Talkback[s])
(Other stories by Jeffrey B. Layton)

"In a previous article I presented two new patch concepts (bcache and flashcache) for improving performance but using SSD's as a caching mechanism for hard drives. In reality the caching is achieved by using a block device to cache another block device, but practically it's using an SSD to cache hard drives. I've been waiting for some time for a patch that increases performance by using a cache that is larger than the disk cache and faster than the disk. SSD's fit that bill pretty well, especially given their fantastic read performance compared to disks.

"This article series tests these patches against some common benchmarks to discover if they can actually improve performance. But before you get your hopes up too high, these patches are still in early development so performance could be all over the map. Just like any patch in the kernel, it takes time to test them, tune them, and integrate them into the kernel. But we can help the developers by testing, which is precisely what this article does."

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