Re: [PATCH] DPDK DAQ Module

[Tiwei Bie <btw () mail ustc edu cn>]

On Thu, Jun 16, 2016 at 09:41:36PM +0300, Maxim Uvarov wrote:
> On 06/16/16 17:37, Tiwei Bie wrote:
> > On Thu, Jun 16, 2016 at 08:42:33PM +0800, Tiwei Bie wrote:
> > > On Thu, Jun 16, 2016 at 02:22:01PM +0300, Maxim Uvarov wrote:
> > > > That is single thread dpdk-daq module, right?
> > > The thread created by rte_eal_init() won't be used. All the daq
> > > methods (e.g. dpdk_daq_acquire) will run on the snort's thread
> > > context.
> > More details:
> >
> > The thread which calls rte_eal_init() will become DPDK's master
> > thread. So, when you only specify one lcore with eal's -c option,
> > such as: -c 40, no DPDK's slave threads will be created. And the
> > affinity of the snort thread which becomes DPDK's master thread
> > will be set to CPU6 (the 7th CPU).
> >
> > When you specify more than one lcores with eal's -c option, such
> > as: -c ff, seven slave threads will be created by rte_eal_init().
> > But they won't be used.
> >
> > And the daq methods (e.g. dpdk_daq_acquire) will be called in the
> > snort thread context.
> >
> > Best regards,
> > Tiwei Bie
>
> I'm asked that question because I had in plan update daq module for
> OpenDataPlane:
> https://github.com/Xiche/daq_odp
>
> And for some previous version there were problems in scaling snort across
> number of cpus.
> Which looks like solved in 3.X and will be never fixed in 2.9.x.
>
> But now I think I can follow your patch to integrate ODP to mainline snort.

Cool! Glad to hear that! :-)

Best regards,
Tiwei Bie


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