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Message-ID: <20170825045036.GA26819@blaptop>
Date:   Fri, 25 Aug 2017 13:50:37 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Nick Terrell <terrelln@...com>
Subject: Re: [PATCH] zram: add zstd to the supported algorithms list

Hi Sergey,

On Thu, Aug 24, 2017 at 11:04:40PM +0900, Sergey Senozhatsky wrote:
> Hi,
> 
> On (08/24/17 13:30), Minchan Kim wrote:
> > Hello Sergey,
> > 
> > On Thu, Aug 24, 2017 at 10:49:36AM +0900, Sergey Senozhatsky wrote:
> > > Add ZSTD to the list of supported compression algorithms.
> > > 
> > > Official benchmarks [1]:
> > 
> > First of all, thanks for the work!
> > 
> > I want to ask one thing.
> > 
> > Could you add some benchmark(e.g.,) result(comp ratio and speed)
> > compared to (inflate, lzo, lz4)?
> > 
> > I want to see how much it's good for small data that ours is 4K.
> 
> 
> so on my syntetic fio test (with a static buffer):
> 
> 
>                      LZO         DEFLATE         ZSTD
> 
> #jobs1                         	                	                
> WRITE:              (2180MB/s)	 (77.2MB/s)    	 (1429MB/s)    
> WRITE:              (1617MB/s)	 (77.7MB/s)    	 (1202MB/s)    
> READ:                (426MB/s)	 (595MB/s)     	 (1181MB/s)    
> READ:                (422MB/s)	 (572MB/s)     	 (1020MB/s)    
> READ:                (318MB/s)	 (67.8MB/s)    	 (563MB/s)     
> WRITE:               (318MB/s)	 (67.9MB/s)    	 (564MB/s)     
> READ:                (336MB/s)	 (68.3MB/s)    	 (583MB/s)     
> WRITE:               (335MB/s)	 (68.2MB/s)    	 (582MB/s)     
> #jobs2                         	                	                
> WRITE:              (3441MB/s)	 (152MB/s)     	 (2141MB/s)    
> WRITE:              (2507MB/s)	 (147MB/s)     	 (1888MB/s)    
> READ:                (801MB/s)	 (1146MB/s)    	 (1890MB/s)    
> READ:                (767MB/s)	 (1096MB/s)    	 (2073MB/s)    
> READ:                (621MB/s)	 (126MB/s)     	 (1009MB/s)    
> WRITE:               (621MB/s)	 (126MB/s)     	 (1009MB/s)    
> READ:                (656MB/s)	 (125MB/s)     	 (1075MB/s)    
> WRITE:               (657MB/s)	 (126MB/s)     	 (1077MB/s)    
> #jobs3                         	                	                
> WRITE:              (4772MB/s)	 (225MB/s)     	 (3394MB/s)    
> WRITE:              (3905MB/s)	 (211MB/s)     	 (2939MB/s)    
> READ:               (1216MB/s)	 (1608MB/s)    	 (3218MB/s)    
> READ:               (1159MB/s)	 (1431MB/s)    	 (2981MB/s)    
> READ:                (906MB/s)	 (156MB/s)     	 (1457MB/s)    
> WRITE:               (907MB/s)	 (156MB/s)     	 (1458MB/s)    
> READ:                (953MB/s)	 (158MB/s)     	 (1595MB/s)    
> WRITE:               (952MB/s)	 (157MB/s)     	 (1593MB/s)    
> #jobs4                         	                	                
> WRITE:              (6036MB/s)	 (265MB/s)     	 (4469MB/s)    
> WRITE:              (5059MB/s)	 (263MB/s)     	 (3951MB/s)    
> READ:               (1618MB/s)	 (2066MB/s)    	 (4276MB/s)    
> READ:               (1573MB/s)	 (1942MB/s)    	 (3830MB/s)    
> READ:               (1202MB/s)	 (227MB/s)     	 (1971MB/s)    
> WRITE:              (1200MB/s)	 (227MB/s)     	 (1968MB/s)    
> READ:               (1265MB/s)	 (226MB/s)     	 (2116MB/s)    
> WRITE:              (1264MB/s)	 (226MB/s)     	 (2114MB/s)    
> #jobs5                         	                	                
> WRITE:              (5339MB/s)	 (233MB/s)     	 (3781MB/s)    
> WRITE:              (4298MB/s)	 (234MB/s)     	 (3276MB/s)    
> READ:               (1626MB/s)	 (2048MB/s)    	 (4081MB/s)    
> READ:               (1567MB/s)	 (1929MB/s)    	 (3758MB/s)    
> READ:               (1174MB/s)	 (205MB/s)     	 (1747MB/s)    
> WRITE:              (1173MB/s)	 (204MB/s)     	 (1746MB/s)    
> READ:               (1214MB/s)	 (208MB/s)     	 (1890MB/s)    
> WRITE:              (1215MB/s)	 (208MB/s)     	 (1892MB/s)    
> #jobs6                         	                	                
> WRITE:              (5666MB/s)	 (270MB/s)     	 (4338MB/s)    
> WRITE:              (4828MB/s)	 (267MB/s)     	 (3772MB/s)    
> READ:               (1803MB/s)	 (2058MB/s)    	 (4946MB/s)    
> READ:               (1805MB/s)	 (2156MB/s)    	 (4711MB/s)    
> READ:               (1334MB/s)	 (235MB/s)     	 (2135MB/s)    
> WRITE:              (1335MB/s)	 (235MB/s)     	 (2137MB/s)    
> READ:               (1364MB/s)	 (236MB/s)     	 (2268MB/s)    
> WRITE:              (1365MB/s)	 (237MB/s)     	 (2270MB/s)    
> #jobs7                         	                	                
> WRITE:              (5474MB/s)	 (270MB/s)     	 (4300MB/s)    
> WRITE:              (4666MB/s)	 (266MB/s)     	 (3817MB/s)    
> READ:               (2022MB/s)	 (2319MB/s)    	 (5472MB/s)    
> READ:               (1924MB/s)	 (2260MB/s)    	 (5031MB/s)    
> READ:               (1369MB/s)	 (242MB/s)     	 (2153MB/s)    
> WRITE:              (1370MB/s)	 (242MB/s)     	 (2155MB/s)    
> READ:               (1499MB/s)	 (246MB/s)     	 (2310MB/s)    
> WRITE:              (1497MB/s)	 (246MB/s)     	 (2307MB/s)    
> #jobs8                         	                	                
> WRITE:              (5558MB/s)	 (273MB/s)     	 (4439MB/s)    
> WRITE:              (4763MB/s)	 (271MB/s)     	 (3918MB/s)    
> READ:               (2201MB/s)	 (2599MB/s)    	 (6062MB/s)    
> READ:               (2105MB/s)	 (2463MB/s)    	 (5413MB/s)    
> READ:               (1490MB/s)	 (252MB/s)     	 (2238MB/s)    
> WRITE:              (1488MB/s)	 (252MB/s)     	 (2236MB/s)    
> READ:               (1566MB/s)	 (254MB/s)     	 (2434MB/s)    
> WRITE:              (1568MB/s)	 (254MB/s)     	 (2437MB/s)    
> #jobs9                         	                	                
> WRITE:              (5120MB/s)	 (264MB/s)     	 (4035MB/s)    
> WRITE:              (4531MB/s)	 (267MB/s)     	 (3740MB/s)    
> READ:               (1940MB/s)	 (2258MB/s)    	 (4986MB/s)    
> READ:               (2024MB/s)	 (2387MB/s)    	 (4871MB/s)    
> READ:               (1343MB/s)	 (246MB/s)     	 (2038MB/s)    
> WRITE:              (1342MB/s)	 (246MB/s)     	 (2037MB/s)    
> READ:               (1553MB/s)	 (238MB/s)     	 (2243MB/s)    
> WRITE:              (1552MB/s)	 (238MB/s)     	 (2242MB/s)    
> #jobs10                        	                	                
> WRITE:              (5345MB/s)	 (271MB/s)     	 (3988MB/s)    
> WRITE:              (4750MB/s)	 (254MB/s)     	 (3668MB/s)    
> READ:               (1876MB/s)	 (2363MB/s)    	 (5150MB/s)    
> READ:               (1990MB/s)	 (2256MB/s)    	 (5080MB/s)    
> READ:               (1355MB/s)	 (250MB/s)     	 (2019MB/s)    
> WRITE:              (1356MB/s)	 (251MB/s)     	 (2020MB/s)    
> READ:               (1490MB/s)	 (252MB/s)     	 (2202MB/s)    
> WRITE:              (1488MB/s)	 (252MB/s)     	 (2199MB/s)    
> 
> jobs1                              perfstat         	                          	                          
> instructions                 52,065,555,710 (    0.79)	  855,731,114,587 (    2.64)	   54,280,709,944 (    1.40)
> branches                     14,020,427,116 ( 725.847)	  101,733,449,582 (1074.521)	   11,170,591,067 ( 992.869)
> branch-misses                    22,626,174 (   0.16%)	      274,197,885 (   0.27%)	       25,915,805 (   0.23%)
> jobs2                              perfstat         	                          	                          
> instructions                103,633,110,402 (    0.75)	1,710,822,100,914 (    2.59)	  107,879,874,104 (    1.28)
> branches                     27,931,237,282 ( 679.203)	  203,298,267,479 (1037.326)	   22,185,350,842 ( 884.427)
> branch-misses                    46,103,811 (   0.17%)	      533,747,204 (   0.26%)	       49,682,483 (   0.22%)
> jobs3                              perfstat         	                          	                          
> instructions                154,857,283,657 (    0.76)	2,565,748,974,197 (    2.57)	  161,515,435,813 (    1.31)
> branches                     41,759,490,355 ( 670.529)	  304,905,605,277 ( 978.765)	   33,215,805,907 ( 888.003)
> branch-misses                    74,263,293 (   0.18%)	      759,746,240 (   0.25%)	       76,841,196 (   0.23%)
> jobs4                              perfstat         	                          	                          
> instructions                206,215,849,076 (    0.75)	3,420,169,460,897 (    2.60)	  215,003,061,664 (    1.31)
> branches                     55,632,141,739 ( 666.501)	  406,394,977,433 ( 927.241)	   44,214,322,251 ( 883.532)
> branch-misses                   102,287,788 (   0.18%)	    1,098,617,314 (   0.27%)	      103,891,040 (   0.23%)
> jobs5                              perfstat         	                          	                          
> instructions                258,711,315,588 (    0.67)	4,275,657,533,244 (    2.23)	  269,332,235,685 (    1.08)
> branches                     69,802,821,166 ( 588.823)	  507,996,211,252 ( 797.036)	   55,450,846,129 ( 735.095)
> branch-misses                   129,217,214 (   0.19%)	    1,243,284,991 (   0.24%)	      173,512,278 (   0.31%)
> jobs6                              perfstat         	                          	                          
> instructions                312,796,166,008 (    0.61)	5,133,896,344,660 (    2.02)	  323,658,769,588 (    1.04)
> branches                     84,372,488,583 ( 520.541)	  610,310,494,402 ( 697.642)	   66,683,292,992 ( 693.939)
> branch-misses                   159,438,978 (   0.19%)	    1,396,368,563 (   0.23%)	      174,406,934 (   0.26%)
> jobs7                              perfstat         	                          	                          
> instructions                363,211,372,930 (    0.56)	5,988,205,600,879 (    1.75)	  377,824,674,156 (    0.93)
> branches                     98,057,013,765 ( 463.117)	  711,841,255,974 ( 598.762)	   77,879,009,954 ( 600.443)
> branch-misses                   199,513,153 (   0.20%)	    1,507,651,077 (   0.21%)	      248,203,369 (   0.32%)
> jobs8                              perfstat         	                          	                          
> instructions                413,960,354,615 (    0.52)	6,842,918,558,378 (    1.45)	  431,938,486,581 (    0.83)
> branches                    111,812,574,884 ( 414.224)	  813,299,084,518 ( 491.173)	   89,062,699,827 ( 517.795)
> branch-misses                   233,584,845 (   0.21%)	    1,531,593,921 (   0.19%)	      286,818,489 (   0.32%)
> jobs9                              perfstat         	                          	                          
> instructions                465,976,220,300 (    0.53)	7,698,467,237,372 (    1.47)	  486,352,600,321 (    0.84)
> branches                    125,931,456,162 ( 424.063)	  915,207,005,715 ( 498.192)	  100,370,404,090 ( 517.439)
> branch-misses                   256,992,445 (   0.20%)	    1,782,809,816 (   0.19%)	      345,239,380 (   0.34%)
> jobs10                             perfstat         	                          	                          
> instructions                517,406,372,715 (    0.53)	8,553,527,312,900 (    1.48)	  540,732,653,094 (    0.84)
> branches                    139,839,780,676 ( 427.732)	1,016,737,699,389 ( 503.172)	  111,696,557,638 ( 516.750)
> branch-misses                   259,595,561 (   0.19%)	    1,952,570,279 (   0.19%)	      357,818,661 (   0.32%)
> 
> 
> seconds elapsed        20.630411534	96.084546565	12.743373571
> seconds elapsed        22.292627625	100.984155001	14.407413560
> seconds elapsed        22.396016966	110.344880848	14.032201392
> seconds elapsed        22.517330949	113.351459170	14.243074935
> seconds elapsed        28.548305104	156.515193765	19.159286861
> seconds elapsed        30.453538116	164.559937678	19.362492717
> seconds elapsed        33.467108086	188.486827481	21.492612173
> seconds elapsed        35.617727591	209.602677783	23.256422492
> seconds elapsed        42.584239509	243.959902566	28.458540338
> seconds elapsed        47.683632526	269.635248851	31.542404137
> 
> 
> over all, ZSTD has slower WRITE, but much faster READ (perhaps a static
> compression buffer helps ZSTD a lot), which results in faster test results.
> 
> now, memory consumption (zram mm_stat file)
> 
> zram-LZO-mm_stat
> mm_stat (jobs1): 2147483648 23068672 33558528        0 33558528        0        0
> mm_stat (jobs2): 2147483648 23068672 33558528        0 33558528        0        0
> mm_stat (jobs3): 2147483648 23068672 33558528        0 33562624        0        0
> mm_stat (jobs4): 2147483648 23068672 33558528        0 33558528        0        0
> mm_stat (jobs5): 2147483648 23068672 33558528        0 33558528        0        0
> mm_stat (jobs6): 2147483648 23068672 33558528        0 33562624        0        0
> mm_stat (jobs7): 2147483648 23068672 33558528        0 33566720        0        0
> mm_stat (jobs8): 2147483648 23068672 33558528        0 33558528        0        0
> mm_stat (jobs9): 2147483648 23068672 33558528        0 33558528        0        0
> mm_stat (jobs10): 2147483648 23068672 33558528        0 33562624        0        0
> 
> zram-DEFLATE-mm_stat
> mm_stat (jobs1): 2147483648 16252928 25178112        0 25178112        0        0
> mm_stat (jobs2): 2147483648 16252928 25178112        0 25178112        0        0
> mm_stat (jobs3): 2147483648 16252928 25178112        0 25178112        0        0
> mm_stat (jobs4): 2147483648 16252928 25178112        0 25178112        0        0
> mm_stat (jobs5): 2147483648 16252928 25178112        0 25178112        0        0
> mm_stat (jobs6): 2147483648 16252928 25178112        0 25178112        0        0
> mm_stat (jobs7): 2147483648 16252928 25178112        0 25190400        0        0
> mm_stat (jobs8): 2147483648 16252928 25178112        0 25190400        0        0
> mm_stat (jobs9): 2147483648 16252928 25178112        0 25178112        0        0
> mm_stat (jobs10): 2147483648 16252928 25178112        0 25178112        0        0
> 
> zram-ZSTD-mm_stat
> mm_stat (jobs1): 2147483648 11010048 16781312        0 16781312        0        0
> mm_stat (jobs2): 2147483648 11010048 16781312        0 16781312        0        0
> mm_stat (jobs3): 2147483648 11010048 16781312        0 16785408        0        0
> mm_stat (jobs4): 2147483648 11010048 16781312        0 16781312        0        0
> mm_stat (jobs5): 2147483648 11010048 16781312        0 16781312        0        0
> mm_stat (jobs6): 2147483648 11010048 16781312        0 16781312        0        0
> mm_stat (jobs7): 2147483648 11010048 16781312        0 16781312        0        0
> mm_stat (jobs8): 2147483648 11010048 16781312        0 16781312        0        0
> mm_stat (jobs9): 2147483648 11010048 16781312        0 16785408        0        0
> mm_stat (jobs10): 2147483648 11010048 16781312        0 16781312        0        0

Thanks for the testing.
Could you resend the patch with this test result with my acked-by?

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

Off-topic:

In all ways, zstd beats deflate. Nick, Right?

With zstd, I doubt we should show "deflate" to user. Many options just
make user confused.
The inflate have been there for representing high comp ratio but slower
speed. However, zstd is better unconditionally compared to deflate
so how about replacing deflate with zstd?

Sergey, what do you think about it?

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