Re: zfs with operations like rm -rf takes a very long time recently

On Sun, Oct 16, 2022 at 7:57 AM void <void@f-m.fm> wrote:
>
> Has anything recently changed in -current that would make file operations
> on zfs such as rm -rf *.* very slow?
>
> What would I look for and how would I test it?
>
> system is FreeBSD 14.0-CURRENT #5 main-n258595-226e41467ee1 on arm64.aarch64
> using GENERIC-NODEBUG kernel.
>
> the zfs is zroot on usb3 on a raspberry pi4 8GB. there appears to be plenty
> of resources. cpu speed is 2.1GHz. zroot is external usb3 hd.
>
> Right now it's rm -rf-ing /var/cache/ccache/* which is 5GB max and it's taken
> over 10 mins. It was never this slow. No errors in /var/log/messages and none
> yet in smartd. zpool scrub last ran successfully 3 days ago.

Do you mean that the space used by that directory is 5 GB max?  Or do
you mean that you have a /var/cache dataset with a 5GB quota?  In the
latter case, if the usage is close to quota, then ZFS can slow down
just as if the pool itself were nearly full.

-Alan