Support for Jumbo Frames (RFD 689)#10472
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rcgoodfellow
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May 22, 2026
| dhcp_config: DhcpCfg::default(), | ||
| // Services do not use attached subnets, only instances. | ||
| attached_subnets: vec![], | ||
| // TODO(RFD 689): plumb the fleet-wide jumbo-frames opt-in |
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Note to self: make follow up issue for this.
rcgoodfellow
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May 22, 2026
| curl -fL -o "$P5P_PATH" "$P5P_URL" | ||
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| RC=0 | ||
| pfexec pkg install -g "$P5P_PATH" driver/network/opte || RC=$? |
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This pattern was not working for me in a4x2 with Helios 3. The new form does work.
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Implements the Omicron side of RFD 689.
Depends on:
Some other fixes included here.
Testing
Lab Environment Performance
I've tested this on
berlin. When the fleet level jumbo flag is set and instances have opted into jumbo, they come up with an 8500 byte MTU in linux. The numbers I see for TCP fromberlinrunning through one of the externald4x4routers is.iperf3client)For UDP
I also tested that a pair of clients with and without jumbo enabled can communicate over both TCP and UDP.
Control Bits
The fleet-level jumbo enable and instance-level jumbo enable have been tested in combination. For an instance to have jumbo frames enabled, both the fleet level setting and the instance level setting must be set to true. I've tested all combinations of these settings with an instance restart in between changes to pick up the setting, and things behave as expected.