"dev" <dev-boun...@openvswitch.org> wrote on 04/21/2016 12:50:17 PM:
> From: Ben Pfaff <b...@ovn.org> > To: dev@openvswitch.org > Cc: Ben Pfaff <b...@ovn.org>, Guru Shetty <g...@ovn.org> > Date: 04/21/2016 12:50 PM > Subject: [ovs-dev] [PATCH v2 2/2] ofproto-dpif: Do not count > resubmit to later tables against limit. > Sent by: "dev" <dev-boun...@openvswitch.org> > > Open vSwitch must ensure that flow translation takes a finite amount of > time. Until now it has implemented this by limiting the depth of > recursion. The initial limit, in version 1.0.1, was no recursion at all, > and then over the years it has increased to 8 levels, then 16, then 32, > and 64 for the last few years. Now reports are coming in that 64 levels > are inadequate for some OVN setups. The natural inclination would be to > double the limit again to 128 levels. > > This commit attempts another approach. Instead of increasing the limit, > it reduces the class of resubmits that count against the limit. Since the > goal for the depth limit is to prevent an infinite amount of work, it's > not necessary to count resubmits that can't lead to infinite work. In > particular, a resubmit from a table numbered x to a table y > x cannot do > this, because any OpenFlow switch has a finite number of tables. Because > in fact a resubmit (or goto_table) from one table to a later table is the > most common form of an OpenFlow pipeline, I suspect that this will greatly > alleviate the pressure to increase the depth limit. > > Reported-by: Guru Shetty <g...@ovn.org> > Signed-off-by: Ben Pfaff <b...@ovn.org> > --- > lib/ofp-actions.c | 19 +++++++++++-- > ofproto/ofproto-dpif-xlate.c | 66 +++++++++++++++++++++++++++++++++ > +---------- > ofproto/ofproto-dpif-xlate.h | 23 +++++++++------ > ofproto/ofproto-dpif.c | 5 ++-- > ofproto/ofproto-dpif.h | 3 +- > tests/ofproto-dpif.at | 41 ++++++++++++++++++++++++++- > utilities/ovs-ofctl.8.in | 28 ++++++++++++++++--- > 7 files changed, 152 insertions(+), 33 deletions(-) I believe I'm seeing some issues with the recursion level as well, so I'd like to get this in and see if it helps... Acked-by: Ryan Moats <rmo...@us.ibm.com> _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
