> -----Original Message-----
> From: Ben Pfaff [mailto:b...@ovn.org]
> Sent: Tuesday, December 8, 2015 4:50 PM
> To: Gray, Mark D
> Cc: Traynor, Kevin; dev@openvswitch.org
> Subject: Re: [ovs-dev] [PATCH] INSTALL.DPDK.md: Clarify DPDK arguments.
>
> On Tue, Dec 08, 2015 at 04:41:37PM +0000, Gray, Mark D wrote:
> > > -----Original Message-----
> > > From: dev [mailto:dev-boun...@openvswitch.org] On Behalf Of Kevin
> > > Traynor
> > > Sent: Monday, December 7, 2015 5:58 PM
> > > To: dev@openvswitch.org
> > > Subject: [ovs-dev] [PATCH] INSTALL.DPDK.md: Clarify DPDK arguments.
> > >
> > > Add some information about the DPDK -c and -n parameters.
> > >
> > > Signed-off-by: Kevin Traynor <kevin.tray...@intel.com>
> > > Reported-by: Zoltan Kiss <zoltan.k...@linaro.org>
> > > ---
> > > INSTALL.DPDK.md | 14 ++++++++++++--
> > > 1 files changed, 12 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/INSTALL.DPDK.md b/INSTALL.DPDK.md index
> > > 96b686c..ee016da
> > > 100644
> > > --- a/INSTALL.DPDK.md
> > > +++ b/INSTALL.DPDK.md
> > > @@ -145,8 +145,18 @@ Using the DPDK with ovs-vswitchd:
> > >
> > > DPDK configuration arguments can be passed to vswitchd via `--dpdk`
> > > argument. This needs to be first argument passed to vswitchd process.
> > > - dpdk arg -c is ignored by ovs-dpdk, but it is a required parameter
> > > - for dpdk initialization.
> > > + The DPDK configuration arguments are passed to DPDK during DPDK
> > > + initialization.
> > > +
> > > + The DPDK -c coremask is a required argument. To avoid wasted
> resources
> > > + only one core should be set. The standard OVS threads (e.g. main
> > > + process, handler, revalidator) will run on the core that is specified.
> >
> > Might be worth mentioning that then there is a corresponding potential
> > decrease in performance of revalidation and flow handling.
>
> With the kernel datapath, OVS sets up flows and revalidates them on
> multiple cores. You're saying that with DPDK it only uses one core?
> Why?
In my opinion, the core mask should define the affinities of the other
threads (main, process, handler, revalidator) and the pmd-cpu-mask
should define the affinities of the packet processing threads. However,
I don't know if this was the intended behavior because the name is a little
too generic ("core mask"). If this was the intended behavior, Kevin and I
just did some tests, and it is not behaving like this.
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