Memory sharing between two primary processes

[Kiran Khatke]

Thanks Pravin.

Do you any comments over memif PMD performance?

Are there any better options than memif PMD in terms of performance?

Kiran


On Mon, Jun 6, 2022 at 6:53 AM Pathak, Pravin <pravin.pathak at intel.com>
wrote:

> Hi Kiran –
>
> It should be possible. DPDK documentation  clearly shows two primary
> processes using memif to communicate.
>
>
>
> *32.2.1. Example: testpmd*
>
> In this example we run two instances of testpmd application and transmit
> packets over memif.
>
> First create master interface:
>
> #./build/app/testpmd -l 0-1 *--proc-type=primary --file-prefix=pmd1*
> --vdev=net_memif,role=master -- -i
>
>
>
> Now create slave interface (master must be already running so the slave
> will connect):
>
> #./build/app/testpmd -l 2-3 *--proc-type=primary --file-prefix=pmd2*
> --vdev=net_memif -- -i
>
>
>
>
>
> *From:* Kiran Khatke <kirankhatke23may at gmail.com>
> *Sent:* Monday, June 6, 2022 9:24 AM
> *To:* Pathak, Pravin <pravin.pathak at intel.com>
> *Cc:* users at dpdk.org
> *Subject:* Re: Memory sharing between two primary processes
>
>
>
> Hi Pravin,
>
>
>
> Both are DPDK application, so want  to use DPDK Share memory i.e hugepages.
>
>
>
> How to share memory between two independent (Primary) application?  Does
> memif PMD allows that ?
>
>
>
> Thanks,
>
> Kiran
>
>
>
> On Mon, Jun 6, 2022 at 5:58 AM Pathak, Pravin <pravin.pathak at intel.com>
> wrote:
>
> Hi Kiran –
>
> Can your application create and manage shared memory on it own without
> using DPDK support ?
>
> Regards
>
> Pravin
>
>
>
> *From:* Kiran Khatke <kirankhatke23may at gmail.com>
> *Sent:* Monday, June 6, 2022 2:26 AM
> *To:* users at dpdk.org
> *Subject:* Memory sharing between two primary processes
>
>
>
> Hi,
>
>
>
> Per DPDK Multiprocess, we know that, it is possible to share
> memory(hugepages) between a primary and secondary Process.  Primary process
> allocates the memory and that is accessible by the secondary (both are
> using same  "--file-prefix=" parameter).
>
>
>
> There is a need in our application, to have two primary processes (started
> with different file-prefix) and would like to know the options - To share
> memory (hugepage) between two primaries and which can give us better
> throughputs.
>
>
>
> During exploration, got to know about memif PMD, which allows for DPDK and
> any other client using memif (DPDK, libmemif) to communicate over shared
> memory.
>
> Do you have any comments about memif performance ? Are there better
> options over memif to share memory between two primaries ?
>
>
>
> Thanks ,
>
> Kiran
>
>
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