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Codex/iperf network benchmark - #606
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Replace per-packet e1000 completion waits with an owned 256-entry TX queue, unify RX delivery so ACKs cannot be stolen by a second consumer, and program the documented transmit timing defaults. Add burst doorbell hints and make socket write readiness follow real TCP backpressure. Co-Authored-By: OpenAI Codex <codex@openai.com>
Advertise a bounded 16 KiB IPv4 TSO path, encode 8254x context and data descriptors with 4 KiB chunks, and retain DMA ownership through final descriptor completion. Correct DTYP_D to lower-dword bit 20 and keep IPv6 on software segmentation. Co-Authored-By: OpenAI Codex <codex@openai.com>
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