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  1. Lustre
  2. LU-9116

overflow of bandwidth caculation at crypto alg test

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: Lustre 2.10.0
    • Labels:
    • Severity:
      3
    • Rank (Obsolete):
      9223372036854775807

      Description

      In our production, we can get more bcount with crc32c crypto alg, but the test program report really bad bandwidth of it as following (with debug patch):
      [42080.712841] bcount=1942, buf_len=1048576, j_start=4338031978, j_end=4338032978, jiffies_to_msecs(end - start):1000
      [42080.712843] Crypto hash algorithm adler32 speed = 1941 MB/s
      [42081.712632] bcount=10633, buf_len=1048576, j_start=4338032978, j_end=4338033978, jiffies_to_msecs(end - start):1000
      [42081.712634] Crypto hash algorithm crc32 speed = 2440 MB/s
      [42082.714242] bcount=462, buf_len=1048576, j_start=4338033978, j_end=4338034979, jiffies_to_msecs(end - start):1001
      [42082.714244] Crypto hash algorithm md5 speed = 461 MB/s
      [42083.713626] bcount=693, buf_len=1048576, j_start=4338034979, j_end=4338035979, jiffies_to_msecs(end - start):1000
      [42083.713628] Crypto hash algorithm sha1 speed = 692 MB/s
      [42084.715960] bcount=282, buf_len=1048576, j_start=4338035979, j_end=4338036981, jiffies_to_msecs(end - start):1002
      [42084.715963] Crypto hash algorithm sha256 speed = 281 MB/s
      [42085.716777] bcount=390, buf_len=1048576, j_start=4338036981, j_end=4338037982, jiffies_to_msecs(end - start):1001
      [42085.716779] Crypto hash algorithm sha384 speed = 389 MB/s
      [42086.717483] bcount=390, buf_len=1048576, j_start=4338037982, j_end=4338038983, jiffies_to_msecs(end - start):1001
      [42086.717485] Crypto hash algorithm sha512 speed = 389 MB/s
      [42087.717192] bcount=12562, buf_len=1048576, j_start=4338038983, j_end=4338039983, jiffies_to_msecs(end - start):1000
      [42087.717194] Crypto hash algorithm crc32c speed = 273 MB/s

      That's because bcount and buf_len are both int, and no force convert in the caculation code:
      tmp = ((bcount * buf_len / jiffies_to_msecs(end - start)) *
      1000) / (1024 * 1024);

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            • Assignee:
              emoly.liu Emoly Liu
              Reporter:
              cengku9660 Gu Zheng (Inactive)
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              Dates

              • Created:
                Updated:
                Resolved: