[herf]

Most people say lz4+ZFS is a net win and you should usually enable it by default.

The big "gap" is probably between lz4 and gzip. e.g., for compressing logs, where gzip compresses a lot more but is terribly slow.

I hope zstd could be used for this case someday: http://facebook.github.io/zstd/

[dmit]

I imagine zstd's license will hamper its corporate adoption, especially among the big players.

  The license granted hereunder will terminate,
  automatically and without notice, if you (or any
  of your subsidiaries, corporate affiliates or
  agents) initiate directly or indirectly, or take
  a direct financial interest in, any Patent
  Assertion: (i) against Facebook or any of its
  subsidiaries or corporate affiliates...

https://github.com/facebook/zstd/blob/dev/PATENTS

[kev009]

Intel's QuickAssist is about to be standard on Xeon E5 chipsets and can do very high scale gzip at the cost of a PCIe round trip. Intel published some patches to ZoL for this.