Does using a extended cache (readyboost-like) improves the overall performance? I read a lot about it and some says that it's just for old machines with low RAM and also the 480mbit/s of usb2.0 was just too slow for cache, and others says that it improves no matter if you got high amounts of ram.

I ask this, because the answers that I found were from a time where usb3.0 was not a standart thing like it's now.

1 Answer 1


Nowadays, extended cache is popular for folks with large databases, and research by Kang, Lee and Moon describes how custom coding to take advantage of flash memory can speed up PostgreSQL.

Bcache's author says it's dandy for RAID6 users, but his raw data also shows inconsistant performance as block sizes decrease, and he did not use USB3, he used an SSD on a SATA cable.

Therefore, I would say yes if you were running with RAID6 or PostgreSQL with the Kang, Lee and Moon code, but questionable otherwise.

  • Thanks for the answer kiloseven. So i guess that for a home user there will be no diference at all...
    – Eddie
    Dec 17, 2013 at 2:04
  • Maybe yes, maybe now, you could measure it and see, but I don't see anything published that's definitive.
    – K7AAY
    Dec 17, 2013 at 16:10

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