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  1. Lustre
  2. LU-11449

osc: send RPCs with random i/o

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Details

    • Bug
    • Resolution: Not a Bug
    • Major
    • None
    • None
    • 3
    • 9223372036854775807

    Description

      LU-8515 modified osc_makes_rpc to remove a check which sent RPCs once the total number of pages == max_pages_per_rpc.  This fixed an issue with > 1 writer per stripe where smaller, fragmented RPCs would be sent instead of full size RPCs.

      However, it introduced a different issue with small random writes, particularly when sparse.  Because small random writes will (in the large file/sparse case) not make complete, contiguous extents, no RPCs will be sent until the max_dirty_mb or grant limit is hit.

      This means that in the small-random-sparse write case not enough RPCs will be sent.

      The solution is to add an additional check for greater than max_pages_per_rpc pages.  Details in patch.

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              pfarrell Patrick Farrell (Inactive)
              paf Patrick Farrell
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                Updated:
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