[linux-lvm] cache performance

Xen list at xenhideout.nl
Thu Dec 14 20:18:56 UTC 2017

Probably not much of interest (16.04 Ubuntu)

Doing readahead tests with cache connected:

- 3400 ms average

Disconnecting cache:

- 5200 ms average

Creating a new cache:

- 2000 ms average

That's a huge difference.

A fresh cache only primed with ureadahead sees its performance go up by 

Maybe more sequential data ended up in the cache.

Who knows.

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