ZFS committed to the FreeBSD base.

Kris Kennaway kris at obsecurity.org
Tue Apr 10 01:55:24 UTC 2007

On Mon, Apr 09, 2007 at 08:42:33PM -0500, Craig Boston wrote:
> 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.

That is a lifetime count of the # of operations, not the current
number allocated ("InUse").

It does look like there is something else using a significant amount
of memory apart from arc, but arc might at least be the major one due
to its extremely greedy default allocation policy.

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