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AM5728: CPSW throughput issue

Part Number: AM5728

Dear all,

I am trying to develop ethernet driver using custom OS, but the issue is that driver is showing exactly same throughput for both 100 MBps and 1GBps. For 1 Gig, I am enabling GIG bit (bit 7) in SL_MACCONTROL register. I have also verified that PHY (KSZ9031) is doing correct autonegotiation at 1 Giga connection. Is there any thing else needed to setup for supporting 1 GBps ? Any help would be really highly appreciated.

Note: Using RGMII mode, Full Duplex, throughput measured by Iperf = 55 MBps for both 100 MBps and 1 GBps, Also note that GBPs connection works fine except throughput issue.

Thanks,
Hamza.