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b6ba0f9fad
Calls to link_up() in the E1000 driver would read the link state directly from the hardware on every call. This had negative performance impact in high throughput situations since link_up() is called every time an IP packet's route is resolved. This patch takes inspiration from the RTL8139 network adapter where the link state is stored in a bool and only updated when the hardware generates an interrupt related to link state change. After this change I measured a ~9% increase in TCP Tx throughput using: cat /dev/zero | nc <host_IP> <host_port> from the Serenity VM to my host machine