SD Card Performance under Different Allocation Sizes

[loyukfai]

Did the test out of interest for checking out which allocation size work best for ReadyBoost.

It's not well controlled, and only shows the differences in CrystalDiskMark benchmark figures between 512-byte, 4-kb and 32-kb allocation sizes. Whether they make a difference when utilized by ReadyBoost, I don't know, and the difference in performance and responsiveness affected by ReadyBoost is marginal under most situations anyway.

Tests done on an X61T which a Toshiba 8GB class 6 SDHC card.


32-kb

Code: Select all

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    16.006 MB/s
          Sequential Write :    13.946 MB/s
         Random Read 512KB :    15.960 MB/s
        Random Write 512KB :     6.646 MB/s
    Random Read 4KB (QD=1) :     7.186 MB/s [  1754.4 IOPS]
   Random Write 4KB (QD=1) :     0.095 MB/s [    23.2 IOPS]
   Random Read 4KB (QD=32) :     7.544 MB/s [  1841.7 IOPS]
  Random Write 4KB (QD=32) :     0.098 MB/s [    23.8 IOPS]

  Test : 50 MB [R: 0.0% (0.1/7868.0 MB)] (x3)
  Date : 2011/11/10 19:21:36
    OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

4-kb

Code: Select all

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    16.014 MB/s
          Sequential Write :    13.481 MB/s
         Random Read 512KB :    15.931 MB/s
        Random Write 512KB :     6.575 MB/s
    Random Read 4KB (QD=1) :     6.945 MB/s [  1695.6 IOPS]
   Random Write 4KB (QD=1) :     0.095 MB/s [    23.2 IOPS]
   Random Read 4KB (QD=32) :     7.507 MB/s [  1832.7 IOPS]
  Random Write 4KB (QD=32) :     0.095 MB/s [    23.3 IOPS]

  Test : 50 MB [R: 0.0% (0.3/7861.0 MB)] (x3)
  Date : 2011/11/10 19:30:00
    OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

512-byte

Code: Select all

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    16.023 MB/s
          Sequential Write :    13.797 MB/s
         Random Read 512KB :    15.929 MB/s
        Random Write 512KB :     6.531 MB/s
    Random Read 4KB (QD=1) :     7.408 MB/s [  1808.5 IOPS]
   Random Write 4KB (QD=1) :     0.092 MB/s [    22.6 IOPS]
   Random Read 4KB (QD=32) :     7.516 MB/s [  1834.9 IOPS]
  Random Write 4KB (QD=32) :     0.094 MB/s [    22.8 IOPS]

  Test : 50 MB [R: 0.0% (1.9/7807.0 MB)] (x3)
  Date : 2011/11/10 19:25:43
    OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

References:

• 64-Bit Vista ReadyBoost and Paging
• Readyboost, file system, allocation unit size, alignment, and everything else you wanted to know about USB flash drives.

[loyukfai]

Under NTFS...


4-kb

Code: Select all

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    15.806 MB/s
          Sequential Write :    12.234 MB/s
         Random Read 512KB :    15.945 MB/s
        Random Write 512KB :     6.555 MB/s
    Random Read 4KB (QD=1) :     7.413 MB/s [  1809.8 IOPS]
   Random Write 4KB (QD=1) :     0.104 MB/s [    25.4 IOPS]
   Random Read 4KB (QD=32) :     7.334 MB/s [  1790.5 IOPS]
  Random Write 4KB (QD=32) :     0.107 MB/s [    26.1 IOPS]

  Test : 50 MB [R: 0.9% (67.3/7870.0 MB)] (x3)
  Date : 2011/11/10 21:56:36
    OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

32-kb

Code: Select all

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    15.840 MB/s
          Sequential Write :    12.143 MB/s
         Random Read 512KB :    15.892 MB/s
        Random Write 512KB :     6.539 MB/s
    Random Read 4KB (QD=1) :     6.955 MB/s [  1697.9 IOPS]
   Random Write 4KB (QD=1) :     0.106 MB/s [    25.9 IOPS]
   Random Read 4KB (QD=32) :     6.993 MB/s [  1707.4 IOPS]
  Random Write 4KB (QD=32) :     0.106 MB/s [    25.8 IOPS]

  Test : 50 MB [R: 0.9% (67.3/7870.0 MB)] (x3)
  Date : 2011/11/10 22:01:24
    OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

512-byte

Code: Select all

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    15.604 MB/s
          Sequential Write :    12.125 MB/s
         Random Read 512KB :    15.941 MB/s
        Random Write 512KB :     6.402 MB/s
    Random Read 4KB (QD=1) :     7.063 MB/s [  1724.4 IOPS]
   Random Write 4KB (QD=1) :     0.102 MB/s [    24.9 IOPS]
   Random Read 4KB (QD=32) :     7.432 MB/s [  1814.4 IOPS]
  Random Write 4KB (QD=32) :     0.104 MB/s [    25.4 IOPS]

  Test : 50 MB [R: 0.9% (69.0/7870.0 MB)] (x3)
  Date : 2011/11/10 22:07:19
    OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)