From: Stephen Hemminger <stephen@networkplumber.org>
To: Staffan Wiklund <staffan491@gmail.com>
Cc: users <users@dpdk.org>
Subject: Re: Impact on DPDK application when using the multi-process feature?
Date: Fri, 26 Nov 2021 09:22:36 -0800 [thread overview]
Message-ID: <20211126092236.7a16dab0@hermes.local> (raw)
In-Reply-To: <CAAV4wThSrxZ2XVW6fF7Ls1KQtNDwSAqv4x=71E65YFvE+cEBnA@mail.gmail.com>
On Fri, 26 Nov 2021 13:27:40 +0100
Staffan Wiklund <staffan491@gmail.com> wrote:
> Hello
>
> I wonder if you please can help me with some questions regarding the DPDK
> multi-process feature?
>
> If a primary process and the secondary processes all execute on different
> CPU cores,
> what limitations are there on the secondary processes when using DPDK
> functions
> for initialization of EAL and for handling ethernet devices?
>
> That is, is a secondary process allowed to call the rte_eal_init function
> or any of
> the rte_eth_xxx functions?
Secondary process has to call rte_eal_init() with secondary (or auto flag).
Which of the rte_eth_xxx functions are you asking about?
> What will happen if a secondary process calls any of these DPDK functions?
>
> The reason for these questions is that I would like to execute 3-4 DPDK
> applications that
> now executes as stand-alone applications as one primary process and the
> other
> applications as secondary processes. All these processes will share memory
> which
> shall be used to improve the speed of communication between the
> applications.
Several applications do this.
> The applications currently use DPDK for Ethernet based communication and I
> would
> like to learn what needs to be modified in order to be able to execute them
> as a
> primary and secondary processes using DPDK shared memory.
>
> Best regards
> Staffan
To be honest, my experience is that not all functions work on all drivers
with the multi-process model. The documentation mostly covers the ones that
don't but you have to be careful and test with particular drivers and use cases.
next prev parent reply other threads:[~2021-11-26 17:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-26 12:27 Staffan Wiklund
2021-11-26 17:22 ` Stephen Hemminger [this message]
2021-11-26 19:49 ` Staffan Wiklund
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