Uops from the legacy decode pipeline

Uops from the legacy decode pipeline

TITLE: Uops from the legacy decode pipeline

ISSUE_NAME: Frontend^UopSource_MITE

DESCRIPTION:

This metric describes the percentage of uops delivered to the micro-op queue that came from the MITE, which is the legacy decode pipeline.

RELEVANCE:

If your application is not bound in the front end then whether micro-ops are coming from the legacy decode pipeline or Decoded ICache is of lesser importance.  If you are front end bound and UopSource_MITE is greater than ~30%, you may want to look into the following:

1)      Investigate why micro-ops are not coming from the Decoded ICache (DSB)

2)      Investigate issues which can impact the legacy decode pipeline (e.g. LCP stalls)

EXAMPLE:

SOLUTION:

RELATED_SOURCES:

NOTES:

EQUATION:  IDQ.MITE_UOPS / (IDQ.MITE_UOPS + IDQ.DSB_UOPS + IDQ.MS_UOPS)

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