GLibC

  1. Bug #2030515
  2. Comment #5

Comment 5 for bug 2030515

Revision history for this message
Bruce Merry (bmerry) wrote :

This also affects Zen 4 (Genoa): 4 GB/s when using 2113 byte copies (which uses REP MOVSB), 115 GB/s when using 2112 byte copies (which does not).

This is with default BIOS settings. It looks like the BIOS on this machine allows the ERMS and FSRM CPUID flags to be turned off.