ZFS v13 performance drops with low memory on FreeBSD-7 STABLE

[Kai Gallasch]

On Mon, 08 Jun 2009 02:55:22 +0200
wrote Ivan Voras <ivoras at freebsd.org>:

> Kai Gallasch wrote:
> > Hi.
> > 
> > So for me this looks like when running applications and ZFS compete
> > for free RAM, ZFS looses. Is that so?
> 
> Yes, that was the point of recent work in stabilizing ZFS - without it
> you would probably panic. With it, ZFS's memory is shrunk down. Unless
> there are other factors (like swapping; are you swapping on ZFS?),
> this is the probable reason for what you're seeing.

No. Swapspace is on a standard swap partition outside the zpool.
# swapinfo 
Device          1K-blocks     Used    Avail Capacity
/dev/da0s3b       8388608    11636  8376972     0%

There's barely swapping taking place on the server.

--Kai.


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