Re: More than 40 minutes to delete an obj tree?

From: Daniel Engberg <diizzy_at_FreeBSD.org>
Date: Sat, 17 Jan 2026 11:01:27 UTC 
On 2026-01-17 10:40, Bjoern A. Zeeb wrote:
> Hi,
>
> I did a universe built yesterday of stable/14.
>
> That accumulates 83G of data in the obj tree (I wanted to know how
> much space we need)
>
> % du -hcsx *
>  27G    amd64.amd64
> 6.9G    arm.armv7
>  13G    arm64.aarch64
> 8.2G    i386.i386
> 5.9G    powerpc.powerpc
> 7.7G    powerpc.powerpc64
> 5.8G    powerpc.powerpc64le
> 8.0G    riscv.riscv64
>  83G    total
>
> I didn't run "time" on the rm -rf of that obj tree but I caught it
> seconds before it was done:
>
> load: 0.56  cmd: rm 91967 [zio->io_cv] 2541.72r 1.52u 81.62s 4% 3972k
>
> Tha machine in questing is a 14.3-STABLE GENERIC and while it is shared
> it's been pretty much idle during that time.
>
> Is it normal that it takes so much real time to cleanup a universe build
> these days or is that a ZFS tuning issue?  It feels a bit excessive.
>
> /bz
>
You're leaving out a lot of relevant information,

System specs:
VM?
Arch, CPU, Amount of RAM, I/O backend? Interface? eMMC, NVME, spinning 
rust etc (model is also of interest)?

Utilization in gstat would also help

Best regards,
Daniel