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Analysis of trim and background maintenance


Write performance after trim

The test is performed on block level (executed in mmc_test.c in the kernel).


  • Write linear to all blocks.
  • Write to random blocks, total of 20% of the card capacity.

Pre-condition TRIM

  • no trim - nothing is done here
  • secure erase - erase the same blocks that will be written to in the TEST, total 128, 256, 512 MiB

Test The test writes 128 MiB linear with different transfer size 4k to 4 MiB. The Pre-condtions are run for every transfer size.

U5500 eMMC

BKOPS is enable on this card but for this test the kernel has no BKOPS support.


WorkingGroups/KernelArchived/Specs/StoragePerfMMC-trim-bg-operations (last modified 2013-01-14 19:34:51)