Re: zfs questions

[Greg Troxel <gdt%lexort.com@localhost>]

Takashi YAMAMOTO <yamt9999%gmail.com@localhost> writes:

> * is anyone using zfs in netbsd seriously? :-)

I am using it on my desktop, and a on a dom0 hosting pkg builders.

It mostly works, except that one must be careful not to simultaneously

  run low on memory
  run programs that dirty mmap'd pages (syncthing!)

and probably also not

  run really low on memory such that there is a lot of paging



As I undertand things, from chuq@ figuring out a deadlock after much
offlist discussion with Brad, there is a deadlock from trying to free
pages from the arc and trying to write dirty pages.  The fix is to have
two threads for this, instead of one doing both, or at least that's how
FreeBSD does it.

> * does anyone have a plan to update the codebase to recent openzfs?

No, but updating would be great.   However, my impression is that the
zfs world is getting messy and I am not sure that FreeBSD is really
based on openzfs as clearly as I think you might think.  Please just
take this as a caution that the situation seems more complicated the
last few years than it was maybe 5y ago.