ZFS default compression algo for contemporary FreeBSD versions

[Volodymyr Kostyrko]

04.07.2013 23:36, Xin Li wrote:
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> On 7/4/13 1:27 PM, Volodymyr Kostyrko wrote:
>> 04.07.2013 19:02, Andriy Gapon wrote:
>>> on 04/07/2013 18:57 Volodymyr Kostyrko said the following:
>>>> Yes. Much better in terms of speed.
>>>
>>> And compression too.
>>
>> Can't really say.
>>
>> When the code first appeared in stable I moved two of my machines
>> (desktops) to LZ4 recreating each dataset. To my surprise gain at
>> transition from lzjb was fairly minimal and sometimes LZ4 even
>> loses to lzjb in compression size. However better
>> compression/decompression speed and moreover earlier takeoff when
>> data is incompressible clearly makes lz4 a winner.
>
> I'm interested in this -- what's the nature of data on that dataset
> (e.g. plain text? binaries? images?)

Triple no. Biggest difference in lzjb favor was at zvol with Mac OS X 
Snow Leo.

Maybe it's just because recordsize is too small on zvols? Anyway the 
difference was like a 1% or 2%. Can't remember but can retest.

-- 
Sphinx of black quartz judge my vow.