ZFS is mysteriously eating my CPU

Re:ZFS is mysteriously eating my CPU by yjftsjthsd-h on Monday September 06, 2021 @12:47AM (#28430376)

Well that was a wild ride - I personally lost it at "We aren't using ZFS." :) I'm surprised that the kernel module was even loaded, though; if they weren't using it, and the only team using ZFS was a minor experimental group, why was it even installed, let alone loaded, let alone burning CPU on a cryptographically randomized noop?

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Re:ZFS is mysteriously eating my CPU by pizza234 on Monday September 06, 2021 @06:00AM (#28432106)

> I'm surprised that the kernel module was even loaded, though

On Ubuntu, some kernel packages install also the zfs modules package. I think (but not 100% sure) that if they're on that O/S, with those packages installed, then the zfs module will be loaded on startup.

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Re:ZFS is mysteriously eating my CPU by chasil on Monday September 06, 2021 @11:43AM (#28434803)

Netflix leans towards FreeBSD.

Is ZFS removable there without recompiling?

https://papers.freebsd.org/2019/fosdem/looney-netflix_and_fr...

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Re:ZFS is mysteriously eating my CPU by NamTaf on Monday September 06, 2021 @12:43PM (#28435498)

Disclaimer: despite using it at home, my BSD-fu is atrocious so I could well be wrong, and I’m not in front of a computer to try. However, I believe that ZFS is its own kernel driver and so, assuming it’s not being used then:

  # kldunload zfs.ko

should do the trick. You would of course have to change the install setup to use UFS rather than a zroot.

I suspect it’s probably loaded by default regardless of OS drive file system, though.

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Re:ZFS is mysteriously eating my CPU by bmoyles on Monday September 06, 2021 @06:29PM (#28438833)

For OpenConnect, not necessarily everywhere else.

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