This is a relatively well known trick for the X520 (82599), can be useful for testing and lab settings.
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Details
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emaste markj - Group Reviewers
Intel Networking Restricted Owners Package (Owns No Changed Paths) - Commits
- rGf6a3934d63fd: ixgbe: Add support for 1Gbit DAC links
rG4de746ee9852: ixgbe: Add support for 1Gbit DAC links
rG48ddd1b9f887: ixgbe: Add support for 1Gbit DAC links
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Diff Detail
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Would be nice to make a note of this in the man page as well (although there might be a lot of other info to backfill first, if going that way).
sys/dev/ixgbe/ixgbe_82599.c | ||
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446–447 | it would fall under the eeprom control below which would yield a 10g link unless someone alters their eeprom to force 1g. |