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MFC r350146 (by imp): Keep track of the number of retried commands.

Description

MFC r350146 (by imp): Keep track of the number of retried commands.

Retried commands can indicate a performance degredation of an nvme drive. Keep
track of the number of retries and report it out via sysctl, just like number of
commands an interrupts.

Details

Provenance
mavAuthored on
Parents
rS350935: MFC r350120 (by imp): Use sysctl + CTLRWTUN for hw.nvme.verbose_cmd_dump.
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