I have a Asus Z790 ProArt Creator Motherboard which has a Intel I226-V (IGC) 2.5G ethernet on board. I'm using Sonoma, and OC 0.9.9. Works like a charm, or so I thought.
I was working on a project last night and started uploading the results and noticed that the upload speed was horribly slow. I did a speedtest, and download was fine, but upload was 0.48 Mbps. Usually it's 22 Mbps. Long story short, if I boot Windows, I get normal speeds up and down with the same stuff.
I'm already using the latest version (1.4) of AppleIGC.kext, and I've tried with and without the e1000=0 boot arg. I've also checked the settings in MacOS and Hardware -> Configure is set to Automatically, and shows up as 1000baseT, full-duplex (which is what I expect with my router).
So I'm truly at a loss here. What on earth could affect only the upload speed, and how can I fix it? I've done multiple web searches, including this sub, and while there were some issues with the IGC cards prior to the release of AppleIGC.kext, the consensus for the last two years has been that using it solves the problems, and I'm already doing that.
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