ZFS committed to the FreeBSD base.

Craig Boston craig at xfoil.gank.org
Tue Apr 10 01:42:37 UTC 2007

On Mon, Apr 09, 2007 at 08:30:35PM -0500, Craig Boston wrote:
> Even the vm.zone breakdown seems to be gone in current so apparently my
> knowledge of such things is becoming obsolete :)

But vmstat -m still works


solaris 145806 122884K       - 15319671 16,32,64,128,256,512,1024,2048,4096

Whoa!  That's a lot of kernel memory.  Meanwhile...

kstat.zfs.misc.arcstats.size: 33554944
(which is just barely above vfs.zfs.arc_min)

So I don't think it's the arc cache (yeah I know that's redundant) that
is the problem.  Seems like something elsewhere in zfs is allocating
large amounts of memory and not letting it go, and even the cache is
having to shrink to its minimum size due to the memory pressure.

It didn't panic this time, so when the tar finished I tried a "zfs
unmount /usr/ports".  This caused the "solaris" entry to drop down to
about 64MB, so it's not a leak.  It could just be that ZFS needs lots of
memory to operate if it keeps a lot of metadata for each file in memory.

The sheer # of allocations still seems excessive though.  It was well
over 20 million by the time the tar process exited.


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