linux-kernel - Re: [PATCH v2 0/8] zram: switch to crypto api

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Date:	Tue, 31 May 2016 21:29:18 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH v2 0/8] zram: switch to crypto api

On (05/31/16 21:20), Sergey Senozhatsky wrote:
>   This has started as a 'add zlib support' work, but after some
> thinking I saw no blockers for a bigger change -- a switch to
> crypto API.
> 
>   We don't have an idle zstreams list anymore and our write path
> now works absolutely differently, preventing preemption during
> compression. This removes possibilities of read paths preempting
> writes at wrong places and opens the door for a move from custom
> LZO/LZ4 compression backends implementation to a more generic one,
> using crypto compress API.
> 
>   This patch set also eliminates the need of a new context-less
> crypto API interface, which was quite hard to sell, so we can
> move along faster.

forgot to attach some benchmarks:

(x86_64, 4GB, zram-perf script)

perf reported run-time fio (max jobs=3)

test-fio-zram-842
     197.907655282 seconds time elapsed
     201.623142884 seconds time elapsed
     226.854291345 seconds time elapsed
test-fio-zram-DEFLATE
     253.259516155 seconds time elapsed
     258.148563401 seconds time elapsed
     290.251909365 seconds time elapsed
test-fio-zram-LZ4
      27.022598717 seconds time elapsed
      29.580522717 seconds time elapsed
      33.293463430 seconds time elapsed
test-fio-zram-LZ4HC
      56.393954615 seconds time elapsed
      74.904659747 seconds time elapsed
     101.940998564 seconds time elapsed
test-fio-zram-LZO
      28.155948075 seconds time elapsed
      30.390036330 seconds time elapsed
      34.455773159 seconds time elapsed


zram mm_stat-s (max fio jobs=3)

test-fio-zram-842
mm_stat (jobs1): 3221225472 673185792 690266112        0 690266112        0        0
mm_stat (jobs2): 3221225472 673185792 690266112        0 690266112        0        0
mm_stat (jobs3): 3221225472 673185792 690266112        0 690266112        0        0
test-fio-zram-DEFLATE
mm_stat (jobs1): 3221225472  24379392  37761024        0  37761024        0        0
mm_stat (jobs2): 3221225472  24379392  37761024        0  37761024        0        0
mm_stat (jobs3): 3221225472  24379392  37761024        0  37761024        0        0
test-fio-zram-LZ4
mm_stat (jobs1): 3221225472  23592960  37761024        0  37761024        0        0
mm_stat (jobs2): 3221225472  23592960  37761024        0  37761024        0        0
mm_stat (jobs3): 3221225472  23592960  37761024        0  37761024        0        0
test-fio-zram-LZ4HC
mm_stat (jobs1): 3221225472  23592960  37761024        0  37761024        0        0
mm_stat (jobs2): 3221225472  23592960  37761024        0  37761024        0        0
mm_stat (jobs3): 3221225472  23592960  37761024        0  37761024        0        0
test-fio-zram-LZO
mm_stat (jobs1): 3221225472  34603008  50335744        0  50335744        0        0
mm_stat (jobs2): 3221225472  34603008  50335744        0  50335744        0        0
mm_stat (jobs3): 3221225472  34603008  50335744        0  50339840        0        0


	-ss