[Flashbench] intel x25 SSD

Arnd Bergmann arnd at arndb.de
Mon Apr 4 03:31:00 UTC 2011 

# need to disable write cache for meaningful tests
$ sudo hdparm -W0 /dev/sdb    

/dev/sdb:
 setting drive write-caching to 0 (off)

# erase size is 10 MB apparently, need a large count to get meaningful data
$ sudo ./flashbench -a --blocksize=10240 /dev/sdb7 --count=1000
align 2013265920        pre 76.5µs      on 77.4µs       post 74.8µs     diff 1.77µs
align 1342177280        pre 61.1µs      on 62.2µs       post 61.3µs     diff 989ns
align 1006632960        pre 73.8µs      on 74.9µs       post 73.6µs     diff 1.22µs
align 671088640 pre 73.7µs      on 74.8µs       post 73.6µs     diff 1.16µs
align 503316480 pre 88.7µs      on 89.8µs       post 86.9µs     diff 1.98µs
align 335544320 pre 88.9µs      on 90.8µs       post 87µs       diff 2.79µs
align 251658240 pre 91.5µs      on 92.7µs       post 88.2µs     diff 2.85µs
align 167772160 pre 91.6µs      on 92.7µs       post 88µs       diff 2.87µs
align 125829120 pre 91.6µs      on 92.5µs       post 88µs       diff 2.71µs
align 83886080  pre 92µs        on 92.9µs       post 88.2µs     diff 2.82µs
align 62914560  pre 91.6µs      on 92.6µs       post 88.3µs     diff 2.71µs
align 41943040  pre 92.1µs      on 92.7µs       post 88.5µs     diff 2.41µs
align 31457280  pre 92µs        on 92.9µs       post 88.2µs     diff 2.78µs
align 20971520  pre 92.1µs      on 92.9µs       post 88.4µs     diff 2.65µs
align 15728640  pre 92.1µs      on 92.1µs       post 88.4µs     diff 1.85µs
align 10485760  pre 92.5µs      on 93µs post 88.3µs     diff 2.64µs
align 7864320   pre 91.7µs      on 91.8µs       post 88.3µs     diff 1.75µs
align 5242880   pre 91.7µs      on 91.8µs       post 88.5µs     diff 1.67µs
align 3932160   pre 90µs        on 89.2µs       post 87.2µs     diff 611ns
align 2621440   pre 89.9µs      on 89.1µs       post 87.1µs     diff 625ns
align 1966080   pre 89.7µs      on 89.2µs       post 87.1µs     diff 786ns
align 1310720   pre 89.9µs      on 89.2µs       post 87.1µs     diff 685ns
align 983040    pre 90.1µs      on 89.2µs       post 87.2µs     diff 489ns
align 655360    pre 89.7µs      on 88.9µs       post 87µs       diff 605ns
align 491520    pre 89µs        on 88.8µs       post 86.9µs     diff 827ns
align 327680    pre 89.5µs      on 89.1µs       post 86.9µs     diff 866ns
align 245760    pre 92µs        on 91.6µs       post 88.4µs     diff 1.44µs
align 163840    pre 89.5µs      on 89.1µs       post 87.3µs     diff 668ns
align 122880    pre 89.2µs      on 89.1µs       post 87.1µs     diff 923ns
align 81920     pre 86.4µs      on 86.5µs       post 85.7µs     diff 430ns
align 61440     pre 86.1µs      on 86µs post 85.9µs     diff 1ns
align 40960     pre 86.8µs      on 86.6µs       post 85.8µs     diff 265ns
align 30720     pre 85.5µs      on 85.5µs       post 87.3µs     diff -866ns
align 20480     pre 86.1µs      on 86.1µs       post 85.4µs     diff 284ns

# page size is 32 KB
$ sudo ./flashbench --open-au --open-au-nr=5 /dev/sdb7 --blocksize=512 --erasesize=$[1024 * 1024]
1MiB    75.8M/s 
512KiB  80.4M/s 
256KiB  67.5M/s 
128KiB  59M/s   
64KiB   43.4M/s 
32KiB   28M/s   
16KiB   15.5M/s 
8KiB    8.48M/s 
4KiB    4.25M/s 
2KiB    2.18M/s 
1KiB    1.1M/s  
512B    553K/s  

# similar numbers for using 10 MB:
$ sudo ./flashbench --open-au --open-au-nr=1 /dev/sdb7 --blocksize=5120 --erasesize=$[10240 * 1024]
10MiB   70.9M/s 
5MiB    73.8M/s 
2.5MiB  76.8M/s 
1.25MiB 77M/s   
640KiB  71.9M/s 
320KiB  80.5M/s 
160KiB  60M/s   
80KiB   54.5M/s 
40KiB   36.5M/s 
20KiB   19.6M/s 
10KiB   9.92M/s 
5KiB    5.28M/s 

#trying larger number of open au:
$ sudo ./flashbench --open-au /dev/sdb7 --blocksize=$[5120 * 8] --erasesize=$[10240 * 1024] --open-au-nr=2
10MiB   76.5M/s 
5MiB    78M/s   
2.5MiB  77.8M/s 
1.25MiB 73.9M/s 
640KiB  70.1M/s 
320KiB  63.9M/s 
160KiB  56.3M/s 
80KiB   53.2M/s 
40KiB   33M/s   
arnd at klappe2:~/git/flashbench$ sudo ./flashbench --open-au /dev/sdb7 --blocksize=$[5120 * 8] --erasesize=$[10240 * 1024] --open-au-nr=3
10MiB   79.1M/s 
5MiB    79.1M/s 
2.5MiB  79M/s   
1.25MiB 73.2M/s 
640KiB  68.6M/s 
320KiB  63M/s   
160KiB  60M/s   
80KiB   54.6M/s 
40KiB   33.1M/s 
arnd at klappe2:~/git/flashbench$ sudo ./flashbench --open-au /dev/sdb7 --blocksize=$[5120 * 8] --erasesize=$[10240 * 1024] --open-au-nr=4
10MiB   76.4M/s 
5MiB    76.9M/s 
2.5MiB  76.5M/s 
1.25MiB 46.1M/s 
640KiB  56.4M/s 
320KiB  51M/s   
160KiB  43.5M/s 
80KiB   53.9M/s 
40KiB   26.5M/s 
arnd at klappe2:~/git/flashbench$ sudo ./flashbench --open-au /dev/sdb7 --blocksize=$[5120 * 8] --erasesize=$[10240 * 1024] --open-au-nr=4
10MiB   78.4M/s 
5MiB    78.5M/s 
2.5MiB  54.5M/s 
1.25MiB 58M/s   
640KiB  54.7M/s 
320KiB  44.7M/s 
160KiB  44.4M/s 
80KiB   41.1M/s 
40KiB   30.5M/s 
arnd at klappe2:~/git/flashbench$ sudo ./flashbench --open-au /dev/sdb7 --blocksize=$[5120 * 8] --erasesize=$[10240 * 1024] --open-au-nr=4
10MiB   24.1M/s 
5MiB    44.2M/s 
2.5MiB  77.6M/s 
1.25MiB 73.9M/s 
640KiB  74.2M/s 
320KiB  80.5M/s 
160KiB  63.1M/s 
80KiB   54.3M/s 
40KiB   36.3M/s 
arnd at klappe2:~/git/flashbench$ sudo ./flashbench --open-au /dev/sdb7 --blocksize=$[5120 * 16] --erasesize=$[10240 * 1024] --open-au-nr=60
10MiB   64.4M/s 
5MiB    70.2M/s 
2.5MiB  78.4M/s 
1.25MiB 71M/s   
640KiB  60.4M/s 
320KiB  69.9M/s 
arnd at klappe2:~/git/flashbench$ sudo ./flashbench --open-au /dev/sdb7 --blocksize=$[5120 * 16] --erasesize=$[10240 * 1024] --open-au-nr=130
10MiB   72.5M/s 
5MiB    73.5M/s 
2.5MiB  73.1M/s 
1.25MiB 69M/s   
640KiB  68.2M/s 
320KiB  69.1M/s 
160KiB  58.5M/s 

Absolutely no effects can be measured based on number of open erase blocks.

	Arnd

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