how did you get a 6500T to idle so low? Is that CPU power or total system power? I have a T part from the next generation, I don't remember the exact model. It's low but it isn't that low.
[0] https://www.hardwareluxx.de/community/threads/die-sparsamste...
[1] https://docs.google.com/spreadsheets/u/0/d/1LHvT2fRp7I6Hf18L...
I didn't do any significant customizations, it runs Alpine Linux. Here is my powertop output:
Summary: 139.6 wakeups/second, 0.0 GPU ops/seconds, 0.0 VFS ops/sec and 0.9% CPU use
Usage Events/s Category Description
100.0% Device Audio codec hwC0D0: Realtek
480.6 µs/s 38.3 Timer tick_nohz_handler
469.0 µs/s 24.6 Timer hrtimer_wakeup
330.0 µs/s 23.2 Process [PID 2121] [irq/132-iwlwifi]
281.2 µs/s 10.1 Process [PID 3278] containerd --config /var/run/docker/containerd/containerd.toml
28.9 µs/s 9.5 kWork toggle_allocation_gate
52.4 µs/s 7.5 Timer inactive_task_timer
279.3 µs/s 4.6 Process [PID 3279] containerd --config /var/run/docker/containerd/containerd.toml
363.9 µs/s 4.5 Process [PID 3306] containerd --config /var/run/docker/containerd/containerd.toml
For perspective, I think the typical NIC consumes several watts of power.