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7c69db50df
The test logic now preallocates memory before running the test. The buffer size is now configurable. Post-copy verification is configurable. The number of copies to chain into one transaction (one interrupt) is configurable. A 'duration' mode is added, which repeats the test until the duration has elapsed, reporting the B/s and transactions completed. ioatcontrol.8 has been updated to document the new arguments. Initial limits (on this particular Broadwell-DE) (and when the interrupts are working) seem to be: 256 interrupts/sec or ~6 GB/s, whichever limit is more restrictive. Unfortunately, it seems the interrupt-reset handling on Broadwell isn't working as intended. That will be fixed in a later commit. Sponsored by: EMC / Isilon Storage Division