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From: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
To: Gao Xiang <hsiangkao@aol.com>
Cc: Chris Mason <clm@fb.com>,
	gregkh@linuxfoundation.org, Kees Cook <keescook@chromium.org>,
	Kernel Team <Kernel-team@fb.com>,
	Adam Borowski <kilobyte@angband.pl>,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
	mingo@kernel.org, Nick Terrell <nickrterrell@gmail.com>,
	Norbert Lange <nolange79@gmail.com>, Petr Malat <oss@malat.biz>,
	Patrick Williams <patrick@stwcx.xyz>,
	Patrick Williams <patrickw3@fb.com>,
	rmikey@fb.com, Sedat Dilek <sedat.dilek@gmail.com>,
	Nick Terrell <terrelln@fb.com>,
	x86@kernel.org
Subject: Re: Kernel compression benchmarks
Date: Wed, 01 Jul 2020 13:32:52 -0400
Message-ID: <1593624505.w282woxb43.none@localhost> (raw)
In-Reply-To: <20200701153028.GA30962@hsiangkao-HP-ZHAN-66-Pro-G1>

Excerpts from Gao Xiang's message of July 1, 2020 11:50 am:
>  Anyway, I think LZMA (xz) is still useful and which is more
>  friendly to fixed-sized output compression than Zstd yet (But
>  yeah, I'm not familar with all ZSTD internals. I will dig
>  into that if I've more extra time).

Yes, I agree. If you look at the graphs, LZMA2 (xz/7zip) still produces 
smaller results, even compared to zstd maximum settings, so definitely 
LZMA2 should be kept, at least for now. I am only suggesting removing 
LZMA, since it has no benefits over xz and zstd combination (bigger than 
xz, slower than zstd).

>> - modern compressors (xz, lz4, zstd) decompress about as fast for each 
>>   compression level, only requiring more memory
> 
>  lz4 has fixed sliding window (dictionary, 64k), so it won't
>  require more memory among different compression level when
>  decompressing.

Yes, this is true. I tried to simplify among all compressors, but I 
think I simplified too much. Thanks for clarifying.

Cheers,
Alex.

  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1588791882.08g1378g67.none.ref@localhost>
2020-07-01 14:35 ` Alex Xu (Hello71)
2020-07-01 15:50   ` Gao Xiang
2020-07-01 17:32     ` Alex Xu (Hello71) [this message]
2020-07-02 15:18   ` Kees Cook
2020-07-03  8:15     ` Sedat Dilek
2020-07-03 16:06       ` Kees Cook
2020-07-03 17:36         ` Norbert Lange
2020-07-06 15:05         ` Nick Terrell
2020-07-26 16:43 Jan Ziak

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