Alexander Boettcher 31e8b50b7c nic/ipxe: batch TX requests ... A bunch of transmit requests received by the Uplink server (nic_router) are currently added one by one to the ring buffer and every time the hardware is notified to process each single request. Instead, add as many as possible transmit requests in the ring buffer of the hardware and when done trigger the hardware to process the ring. Additionally, don't receive an "processed" TX IRQ for each element in the ring, which causes high CPU load. With this commit the TX IRQs in the ipxe driver for a iperf -c X.X.X.X -t 60 from within a VM to the outside iperf server is reduced from about ~2'600'000 IRQs to about ~200'000. The overall CPU load for the driver (when executed alone on CPU 0) is reduced from ~85 percent load to ~45 percent load. Issue #5149		2024-04-12 15:00:43 +02:00
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dde_ipxe	nic/ipxe: batch TX requests	2024-04-12 15:00:43 +02:00