Yeah, for a period I had the system gobble up vast amounts of RAM while
running Virtualbox. I tried capping the ARC (in some config file I
believe, can't remember) but that didn't help. In the end I discovered
that this happened when the virtual machines did network intensive tasks
over a NAT connection and the problems disappeared when I switched to
bridged networking. I filed a bug report and the Virtualbox team fixed
the bug in version 3.2.12.
On 2011-11-04 16:41, Michael Stapleton wrote:
Hello,
There is an issue running VirtualBox with ZFS. ZFS will cause
fragmentation of memory which is usually not a problem, but due to the
nature of how VirtualBox attempt to lock down continuous chunks of RAM,
it is a problem for VBox. If you are running VBox and ZFS, cap the ARC
cache...
Mike,
On Fri, 2011-11-04 at 10:39 -0400, Daniel Kjar wrote:
I have seen that in plenty of places and I 'know' it to be true but as I
watch zfs swallow all of my ram and my server ends up stuttering (when
it shouldn't) then I have to do something. Although everything
everywhere says that ZFS gives it up whenever asked many comments from
oracle and the zfs tuning guide hint that it isn't really that good at
giving it up. Some processes don't know the right way to ask (exert
pressure) etc. Also, when ZFS was young Sun kept saying that it using
all of the available ram was harmless but... later they figured out
there was a bug in how it was handling the process of detecting memory
constraints on the system and now there are known scenarios when
limiting ZFS hunger is called for.
I was just hoping there was something else going on here with 151a but I
see now that is not the case.
On 11/ 4/11 10:28 AM, Rob McMahon wrote:
On 04/11/2011 13:13, Daniel Kjar wrote:
pmap seems to give me exactly what top tells me.
Remember top will almost always show low free memory. Free memory is
wasted memory, it gets filled by filesystem cache, zfs or otherwise,
and re-used when needed. Look at e.g. `vmstat 5' to look for memory
issues.
Rob
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