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

> On 17. Jan 2026, at 11:40, Bjoern A. Zeeb <bzeeb-lists@lists.zabbadoz.net> 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
> 


Different factors may be involved and both [d]tracing and patch level analysis are needed to understand it. 

For workaround, zfs destroy should be a bit faster than rm -rf (unless there is deduplication involved….).

rgds,
toomas