linux-kernel - Re: [PATCH 2/2] zram: remove zlib from the list of recommended algorithms

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Message-ID: <20170913071246.GB2975@bbox>
Date:   Wed, 13 Sep 2017 16:12:46 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH 2/2] zram: remove zlib from the list of recommended
 algorithms

On Tue, Sep 12, 2017 at 02:00:05PM +0900, Sergey Senozhatsky wrote:
> ZSTD tends to outperform deflate/inflate, thus we remove
> zlib from the list of recommended algorithms and recommend
> zstd instead.
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Suggested-by: Minchan Kim <minchan@...nel.org>

I did test with my sample data and compared zstd with deflate.
zstd's compress ratio is lower a little bit but compression
speed is much faster 3 times more and decompress speed is too
2 times more. With different data, it is different but overall,
zstd would be better for speed at the cost of a little lower compress
ratio(about 5%) so I believe it's worth to replace deflate.

Thanks for the patch, Sergey.

Acked-by: Minchan Kim <minchan@...nel.org>