[dpdk-dev] Is it possible to get symmetric hash from RSS for a given flow

Stefan Baranoff sbaranoff at gmail.com
Fri Feb 28 02:08:01 CET 2014

Has anyone already applied this logic to IP only load balancing to get
SRC/DST and DST/SRC on the same queue and come up with an RSK value? If not
I'll spend some time with a calculator and see if I can get one.


Sent from my smart phone; people don't make typos, Swype does!
On Feb 27, 2014 8:04 PM, "Daniel Kan" <dan at nyansa.com> wrote:

> Thanks, Sangjin. This is exactly i'm looking for. Sorry, I should've
> googled it first. It's good to know that hash key of repetitive 0x6d5a
> still yields good load balancing results.
> Dan
> On Feb 27, 2014, at 4:24 PM, Sangjin Han <sangjin at eecs.berkeley.edu>
> wrote:
> > Hi,
> >
> > This is exactly what you want:
> > http://www.ndsl.kaist.edu/~shinae/papers/TR-symRSS.pdf
> >
> > Sangjin
> >
> > On Thu, Feb 27, 2014 at 4:22 PM, Daniel Kan <dan at nyansa.com> wrote:
> >> Hi,
> >> It appears that the hash computed from RSS is unidirectional. Hence,
> for a 5-tuple flow, packet in one direction can be routed to a queue that
> may be different than packet in the other direction. I'm wondering if there
> is a configuration or mechanism to get a symmetric hash so that all packets
> for a given flow will be in the same queue. Thanks in advance.
> >>
> >> Dan

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