On Thu, Nov 7, 2013 at 2:44 AM, Robert Voinea <rvoinea(at)gmail(dot)com> wrote:
>
> Could you give me some hints on what to look for?
> What might be causing this behavior?
>
Possibly checkpointing is the problem? Is "log_checkpoints" enabled in your
postgresql.conf? What is "checkpoint_completion_target" set to?