No, the Tx of 40- and 100-Gbps Ethernet MAC and PHY IP Core cannot achieve 100 % bandwidth for some packet sizes if the preamble pass-through or the TX CRC pass-through options are enabled. The RX can reach 100 % bandwidth regardless of options.
Device Family: Arria® V GZ, Stratix® IV GT, Stratix® IV GX, Stratix® V GS, Stratix® V GT, Stratix® V GX
Area: Intellectual Property
Disable both the preamble pass-through option and the TX CRC pass-through option.
Another workaround is to migrate to the Low Latency 40- and 100-Gbps Ethernet MAC and PHY IP Core.