[ovs-discuss] I want to know how group table select works

[허지민]

Well, I am sure about it.
Destination or source did not change.

There is nothing like timeout???

I thought that after a long term without any networking, all the hashed
data would be erased.


2016-08-02 14:11 GMT+09:00 Ben Pfaff <blp at ovn.org>:

> Probably your new flows have different source or destination TCP ports.
>
> On Tue, Aug 02, 2016 at 01:57:08PM +0900, 허지민 wrote:
> > I'am using 2.5.0
> >
> > 2016-08-02 13:08 GMT+09:00 Ben Pfaff <blp at ovn.org>:
> >
> > > What version of Open vSwitch are you using?
> > >
> > > On Tue, Aug 02, 2016 at 11:29:22AM +0900, 허지민 wrote:
> > > > Thank you for answering.
> > > >
> > > > I'm not sure if I understood right.
> > > >
> > > > The answer is saying that, if I don't change source or destination,
> > > bucket
> > > > selection won't be redone?
> > > >
> > > > Well, I am using group table for my project, and each bucket in the
> group
> > > > has
> > > > different weight. When I tested group table, I found out that after
> long
> > > > term without networking, the selection has changed and send packets
> to
> > > > different bucket.
> > > >
> > > > How does weight of the bucket influence the selection???
> > > >
> > > > 2016-08-02 2:10 GMT+09:00 Ben Pfaff <blp at ovn.org>:
> > > >
> > > > > On Mon, Aug 01, 2016 at 05:39:10PM +0900, 허지민 wrote:
> > > > > > I am working on a project using group table select.
> > > > > >
> > > > > > I am figuring out how group table select one of the buckets that
> is
> > > added
> > > > > > in the group.
> > > > >
> > > > > This is in the FAQ.
> > > > >
> > > > > ### Q: How does OVS divide flows among buckets in an OpenFlow
> "select"
> > > > > group?
> > > > >
> > > > > A: In Open vSwitch 2.3 and earlier, Open vSwitch used the
> destination
> > > > >    Ethernet address to choose a bucket in a select group.
> > > > >
> > > > >    Open vSwitch 2.4 and later by default hashes the source and
> > > > >    destination Ethernet address, VLAN ID, Ethernet type, IPv4/v6
> > > > >    source and destination address and protocol, and for TCP and
> SCTP
> > > > >    only, the source and destination ports.  The hash is
> "symmetric",
> > > > >    meaning that exchanging source and destination addresses does
> not
> > > > >    change the bucket selection.
> > > > >
> > > > >    Select groups in Open vSwitch 2.4 and later can be configured to
> > > > >    use a different hash function, using a Netronome extension to
> the
> > > > >    OpenFlow 1.5+ group_mod message.  For more information, see
> > > > >    Documentation/group-selection-method-property.txt in the Open
> > > > >    vSwitch source tree.  (OpenFlow 1.5 support in Open vSwitch is
> still
> > > > >    experimental.)
> > > > >
> > >
>
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