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Date: Wed, 02 Dec 2015 23:06:27 +0900
From: Tomasz Chmielewski <tch@virtall.com>
To: Wang Shilong <wangshilong1991@gmail.com>
Cc: Austin S Hemmelgarn <ahferroin7@gmail.com>,
        linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: compression disk space saving - what are your results?
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On 2015-12-02 23:03, Wang Shilong wrote:

>> Compression ratio is much much better now (on a slightly changed data 
>> set):
>> 
>> # df -h
>> /dev/xvdb       200G   24G  176G  12% /var/log/remote
>> 
>> 
>> # du -sh /var/log/remote/
>> 138G    /var/log/remote/
>> 
>> 
>> So, 138 GB files use just 24 GB on disk - nice!
>> 
>> However, I would still expect that compress=zlib has almost the same 
>> effect
>> as compress-force=zlib, for 100% text files/logs.
> 
> btw, what is your kernel version? there was a bug that detected inode
> compression
> ration wrong.
> 
> http://git.kernel.org/cgit/linux/kernel/git/mason/linux-btrfs.git/commit/?id=68bb462d42a963169bf7acbe106aae08c17129a5
> http://git.kernel.org/cgit/linux/kernel/git/mason/linux-btrfs.git/commit/?id=4bcbb33255131adbe481c0467df26d654ce3bc78

Linux 4.3.0.


Tomasz Chmielewski
http://wpkg.org/