On Wed, Nov 09, 2011 at 01:19:42PM -0800, Ben Pfaff wrote: > On Mon, Nov 07, 2011 at 04:20:19PM +0900, Simon Horman wrote: > > Although a very simple and possibly na??ve approach, I wonder if > > dynamically extending the interval at which statistics are collected is > > a worthwhile approach to mitigating the performance impact of statistics > > collection. > > It's one approach. It has the nice property of being very simple. > > Another approach that I've been pondering myself is, when there are many > datapath flows, to read out the kernel stats for only some of them at a > time and apply the expiration algorithm to just those. We could run > expiration just as frequently overall, but it would apply to any given > flow less frequently.
Hi Ben, I had also considered that and I think it an approach worth investigating. It seems to me that the main challenge will be arrange things such that a partial statistics update can occur while still allowing all statistics to be updated over time. I wonder if partitioning the flow hash would be a reasonable way to achieve this. _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
