Generalize tlb_port | improve NBDcache performance #3588
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io.tlb_portis now shared for both DCache and NBDCacheNBDcache doesn't replay CPU until IOMSHRs have responded
In the NBDcache, AMO operations to outer memory which do not write back into registers now no longer steal the write port
Related issue:
Type of change: bug report | feature request | other enhancement
Impact: no functional change | API addition (no impact on existing code) | API modification
Development Phase: proposal | implementation
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