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slow write BW observed beyond 64KB size #2

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drossetti opened this issue Aug 24, 2016 · 1 comment
Closed

slow write BW observed beyond 64KB size #2

drossetti opened this issue Aug 24, 2016 · 1 comment
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@drossetti
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This has been reported by Mark Mark Silberstein mark@ee.technion.ac.il

We finally pinpointed the setup, and it's easily reproducible.

  1. Get the CPU ptr for the buffer in the mapped BAR
  2. Sequentially pread from file into that buffer in blocks >=64K.

As long as blocks are less than 64K, we get ~1GB/s. For blocks >= 64K we get around 13MB/s
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@drossetti