Re: BTRFS setup advice for laptop performance ?

[Koen Kooi <koen@dominion.thruhere.net>]

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Marc MERLIN schreef op 12-04-14 15:17:
> On Fri, Apr 04, 2014 at 04:09:06PM +0100, Hugo Mills wrote:
>>> - Generally speaking, does LZO compression improve or degrade
>>> performance ? I'm not able to figure it out clearly.
>> 
>> Yes, it improves or degrades performance. :)
>> 
>> It'll depend entirely on what you're doing with it. If you're storing
>> lots of zeroes (Phoronix, I'm looking at you), then you'll get huge
>> speedups. If you're storing video data, you'll get a (very) slight
>> performance drop as it scompresses the first few blocks of the file and
>> then gives up. I suspect that in general, the performance differences
>> won't be noticable unless you have highly compressible large files, but
>> if you _really_ care about it, benchmark it(*).
>> 
>> Hugo.
>> 
>> (*) If you don't want to go through the effort of benchmarking, you 
>> don't care enough about it, and should just pick something at random.
> 
> Speaking of this bit, I once tried to use zlib instead of lzo, and
> somehow it felt that my laptop on SSD booted noticeably slower after
> that, which felt weird since decompression speed should be about the
> same.
> 
> Has anyone else noticed anything like this?

LZO should decompress a lot faster than zlib, I know that's the case on ARM
and 32bit x86.

regards,

Koen

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