EnhanceIO, Bcache & DM-Cache Benchmarked
Written by Michael Larabel in Linux Kernel on 11 June 2013 at 11:21 AM EDT. Add A Comment
LINUX KERNEL --
Three different Linux disk caching methods for the Linux kernel were compared: EnhanceIO, Bcache, and DM-Cache. But which of these disk caching methods is the fastest when mixing SSDs and HDDs? Here's some results.

A Linux engineer at STEC Inc compared the performance of EnhanceIO, BCache, and DM-Cache. A 100GB HDD was used with a 20GB SSD providing write-through / write-back cache. For those out of the look on these different caching methods:

- EnhanceIO is a new SSD caching method for Linux and was merged for Linux 3.9 staging. For those unfamiliar with EnhanceIO, read those aforelinked articles.

- BCache is another caching method and the HDD/SSD caching method was merged for Linux 3.10. Again, click those articles for more information.

- Lastly, DM-Cache is the device mapper cache and aims to improve the performance of block devices by dynamically migrating data to faster/smaller devices (SSDs).

In terms of the company's results between EnhanceIO, BCache, and DM-Cache, on the Linux kernel mailing list are their full results.

The summary? "We found that EnhanceIO provides better throughput on zipf workload (with theta=1.2) in comparison to bcache and dm-cache for write through caches. However, for write back caches, we found that dm-cache had best throughput followed by EnhanceIO and then bcache. Dm-cache commits on-disk metadata every time a REQ_SYNC or REQ_FUA bio is written. If no such requests are made then it commits metadata once every second. If power is lost, it may lose some recent writes. However, EnhanceIO and bcache do not acknowledge IO completion until both IO and metadata hits the SSD. Hence, EnhanceIO and bcache provide higher data integrity at a cost of performance."
Related News
About The Author
Author picture

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

Popular News This Week

çeviri malatya oto kiralama parça eşya taşıma şehirler arası nakliyat şehirlerarası evden eve nakliyat istanbul bursa şehirler arası nakliyat malatya oto kiralama istanbul evden eve nakliyat ofis taşıma ofis taşımacılığı evden eve nakliyat evden eve nakliyat büyü aşk büyüsü ayırma büyüsü medyum medyum şikayetleri medyum yorumları büyü aşk büyüsü bağlama büyüsü dua aşk duası aşk büyüsü büyü aşk büyüsü bağlama büyüsü medyum dolunay medyum aşk büyüsü medyum medyum şikayetleri medyum yorumları metal galvanizli sac paslanmaz sac metal hrp sac paslanmaz çelik mekjoy.com seo seo kursu sex shop istanbul sex shop ataşehir sex shop İstanbul evden eve nakliyat eşya depolama eşya depolama viagra fiyatı cialis fiyat b374k shell