[OpenAFS] peak vnodes <number> (fwd)

Steven Jenkins steven.jenkins@gmail.com
Mon, 30 Mar 2009 09:31:04 -0400

On Mon, Mar 30, 2009 at 8:29 AM, Dimitris Zilaskos
<dzila@tassadar.physics.auth.gr> wrote:
> After moving to 2.6.29 the following started showing up in kernel logs. What
> does it mean?
> uname -an
> Linux tassadar 2.6.29 #1 Sat Mar 28 22:52:51 EET 2009 i686 unknown unknown
> GNU/Linux
> dmesg|grep peak|head
> peak vnodes: 4164

It means that your system had to dynamically allocate some vnodes
because you needed more than whatever you had provided as an argument
to afsd (i.e., the '-stat' argument was too low).  Based on what you
included in your mail, you should probably set your -stat value to at
least 11000.

Note that you do not have to change your -stat value -- the AFS kernel
module will use the -stat value as the default starting value and
increase dynamically as needed.  However, if you provide a higher
-stat value, you will save some overhead as AFS will not need to do
the dynamic allocation.

I would be very interested in seeing performance numbers of the two
configurations (the configuration  you have now vs a configuration
when you have set -stat to be 11000 or so).

Steven Jenkins
End Point Corporation