Improve network performance

[JayFoxRox]

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We need better network performance for various tasks:

• nv2a-trace (streaming/sending a lot of memory)
• xbe-loader (XISO streaming)
• Realtime games (enet for example, which is already ported in https://github.com/JayFoxRox/nxdk/pull/84)
• Audio communication over network when #438 hits and XBL Communicator support lands

This is a collection of unfinished work by @thrimbor in that area:

• https://github.com/thrimbor/nxdk/commits/net_improvements_clean
• https://github.com/thrimbor/nxdk/commits/net_improvements
• https://github.com/thrimbor/nxdk/commits/nvnetdrv
• https://github.com/thrimbor/nxdk/commits/pktdrv_perf

I'm not sure what the plans are.

I also checked, and we are already on latest stable lwip.

[dracc]

Not to mention NevolutionX ftp/sntp/...

Less important when xbe-loader becomes performant but still nice-to-have IMO.

[Ryzee119]

For visibility, Thrimbor and I have been working more on nvnetdrv. https://github.com/Ryzee119/nxdk/tree/nvnetdrv/lib/nvnetdrv I have been using it for some time and is working very well for me with excellent performance >90mbit/s normally

Might just need a few more tweaks

[dracc]

For visibility, Thrimbor and I have been working more on nvnetdrv. https://github.com/Ryzee119/nxdk/tree/nvnetdrv/lib/nvnetdrv I have been using it for some time and is working very well for me with excellent performance >90mbit/s normally

Might just need a few more tweaks

Care to create a draft PR? Great work that's a bit hard to keep track of for outsiders. :)