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by alberth 882 days ago
How does this compare to other BSDs?

Wasn't there recently a lot of work to reduce the time on FreeBSD (and it's 20ms)

https://www.usenix.org/publications/loginonline/freebsd-fire....
2 comments
dchest 882 days ago
"I think the fastest I got the FreeBSD kernel booting in Firecracker was 21 ms. NetBSD is now at 18 ms... I need to go back and address some more of the issues I noticed but didn't get around to fixing.

Anyone know what the current record for Linux is? Last I heard was ~50 ms."

- @cperciva at https://twitter.com/cperciva/status/1747270461095043532

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alberth 882 days ago
> “I need to go back and address some more of the issues I noticed but didn't get around to fixing.”

I wonder if this is related to what Netflix found as a regression.

Starting at slide #18 below

https://people.freebsd.org/~gallatin/talks/OpenFest2023.pdf

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cperciva 881 days ago
The bug Netflix tripped over was something I introduced while shaving off milliseconds, yes.

The "other issues I didn't get around to fixing" are things like precomputing lookup tables (we can wait and do them on demand, or not at all if they turn out to never get used) and an O(n^2) issue registering names of sysctls.

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jedberg 882 days ago
This work is based on the FreeBSD work.
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