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  1. Lustre
  2. LU-12179

allocate continuous pages when disabled page caches

    Details

    • Type: Improvement
    • Status: Open
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Labels:
      None
    • Rank (Obsolete):
      9223372036854775807

      Description

      LU-11347: Do not use pagecache for SSD I/O when read/write cache are disabled, 

      this feature allocates the physical pages per OSS I/O thread in need at the runtime, it may result that  the many allocated pages are  not physical continuous. This may be not good for I/O merge in the block layer due to the limited segements per block I/O request.

      For testing purposes, we should pre-allocate continuous pages when OSS thread started as much as possible when disable page chace.

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              • Assignee:
                qian_wc Qian Yingjin
                Reporter:
                qian_wc Qian Yingjin
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                • Created:
                  Updated: