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Benchmarks with and without UASP on A20 device

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Jul 21st, 2015
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  1. root@pcduino3nano:~# lsusb
  2. Bus 001 Device 002: ID 174c:55aa ASMedia Technology Inc.
  3. Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc.
  4. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  5. Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  6. Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  7. Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  8.  
  9.  
  10. sda: Samsung EVO 840
  11. sdb: Seagate Barracuda
  12.  
  13. Unfortunately both enclosures containing ASMedia bridge chips that are blacklisted. I simply disabled the blacklisting for the UAS tests.
  14.  
  15. Sequential speed tests performed utilising "iozone -a -g 2000m -s 2000m -i 0 -i 1 -r4k" and "iozone -a -g 2000m -s 2000m -i 0 -i 1 -r1024k". Test system was a pcDuino3 Nano with 960MHz max. cpufreq and performance governor.
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  20. Kernel 4.1.1 without UAS:
  21.  
  22. sda: 2048000 4 36401 35694 31885 31975
  23. sdb: 2048000 4 33973 33736 34872 35000
  24.  
  25. RAID-0 (mkfs.btrfs -f -m raid1 -d raid0 /dev/sda1 /dev/sdb4):
  26.  
  27. raid-0: 2048000 4 55898 54675 58267 58371
  28. raid-0: 2048000 4 56823 55144 58399 58713
  29. raid-0: 2048000 1024 55325 54431 56796 57085
  30.  
  31. RAID-0 (mkfs.btrfs -f -m raid0 -d raid0 /dev/sda1 /dev/sdb4):
  32.  
  33. raid-0: 2048000 4 56580 54841 57956 58326
  34. raid-0: 2048000 1024 55766 54589 56926 57229
  35.  
  36. MD-RAID-0 (mdadm --create /dev/md0 --level=0 --raid-devices=2 --assume-clean /dev/sdb4 /dev/sda1 && mkfs.ext4 -b 4096 /dev/md0):
  37.  
  38. raid-0: 2048000 4 67100 67866 67527 67519
  39. raid-0: 2048000 1024 64186 66277 66112 66217
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  44.  
  45. Kernel 4.1.2 with CONFIG_USB_UAS=m and disabled UAS blacklisting for ASM1051/ASM1053:
  46.  
  47. sda: 2048000 4 35991 37753 37129 37297
  48. sdb: 2048000 4 37532 37942 37412 37778
  49.  
  50. Accessing both disks at the same time:
  51.  
  52. sda: 2048000 4 34475 36279 35799 36478
  53. sdb: 2048000 4 36266 36561 37689 37958
  54.  
  55. RAID-0 (mkfs.btrfs -f -m raid1 -d raid0 /dev/sda1 /dev/sdb4):
  56.  
  57. raid-0: 2048000 4 72920 73634 75031 77766
  58. raid-0: 2048000 4 72505 73182 72964 71941
  59.  
  60. RAID-0 (mkfs.btrfs -f -m raid0 -d raid0 /dev/sda1 /dev/sdb4):
  61.  
  62. raid-0: 2048000 4 72435 73808 77563 74847
  63. raid-0: 2048000 1024 73877 73593 76350 74143
  64.  
  65. MD-RAID-0 (mdadm --create /dev/md0 --level=0 --raid-devices=2 --assume-clean /dev/sdb4 /dev/sda1 && mkfs.ext4 -b 4096 /dev/md0):
  66.  
  67. raid-0: 2048000 4 69961 71162 72975 69516
  68. raid-0: 2048000 1024 68981 70714 71832 70780
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