Fraction of uOps delivered by the DSB (known as Decoded ICache or uOp Cache).
A significant fraction of uOps was not delivered by the DSB (known as Decoded ICache or uOp Cache). This may happen if a hot code region is too large to fit into the DSB.
Consider changing the code layout (for example, via profile-guided optimization) to help your hot regions fit into the DSB.
See the "Optimization for Decoded ICache" section in the Intel 64 and IA-32 Architectures Optimization Reference Manual.