[SPDK] Re: DPDK git submodule and external DPDK build/repo

Hi Nick,

SPDK updates the DPDK submodule to the latest release available at the time. For example SPDK 20.10 will have a submodule based on DPDK 20.08.
DPDK submodule in SPDK is a fork of DPDK https://github.com/spdk/dpdk/commits/spdk-20.08. This is done just to reduce compile time for unused libraries from DPDK and sometimes to put required fixes which are in process of review on DPDK.

Starting any SPDK application is a simple way to figure out what version is used. During start up following log will be presented:
"Starting SPDK v20.10-pre git sha1 c93b73dad / DPDK 20.08.0 initialization..."

As for compatibility, the latest DPDK LTS (19.11.5) should always work with current SPDK release - either LTS (SPDK 20.01.2) or latest quarterly release (SPDK 20.07).

Thanks,
Tomek

> -----Original Message-----
> From: nickispdk(a)gmail.com <nickispdk(a)gmail.com>
> Sent: Tuesday, October 13, 2020 6:58 PM
> To: spdk(a)lists.01.org
> Subject: [SPDK] DPDK git submodule and external DPDK build/repo
> 
> Hi!
> What it the policy of updating the DPDK git submodule. How can I figure out
> what DPDK version is in the submodule.
> Is there any compatibility matrix for SPDK version vs. DPDK version?
> 
> Thank you in advance,
> 
> Nick
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