Re: [dpdk-users] Need help: Generate core list error. rte_eal port num [0] is not match the pciidlist [4]

[Vincent Li <vincent.mc.li@gmail.com>]

On Tue, 2 Jun 2020, Ding Ma wrote:

> Really appreciate your help. Two follow-ups:
> - it actually works on 48 cores server and do you know why?  (The problem
> server is 96 cores)

I think Stephen might mean your pre-build DPDK might not be built with 32 
cores, I am not familiar with this neither, but I here is my grep search:

/usr/src/dpdk# egrep  'CORE|CPU' x86_64-native-linux-gcc/.config

CONFIG_RTE_MAX_LCORE=128
# Recognize/ignore architecture we compile for. AVX/AVX512 CPU flags for 
performance/power testing.
CONFIG_RTE_MAX_LCORE_FREQS=64
CONFIG_RTE_TEST_PMD_RECORD_CORE_CYCLES=n

I guess your pre-built DPDK might have CONFIG_RTE_MAX_LCORE built less 
than 96, you can either rebuilt your DPDK RPM package or rebuild from DPDK 
source with cores >= 96, say 128


> - which part in config I need to change? (Sorry I am a noob) . Also, I am
> using pre-built RPM to install dpdk, do I have to rebuild the RPM on 96
> cores server in order to run it on the 96 cores server?
> 
> On Tue, Jun 2, 2020 at 7:21 PM Stephen Hemminger <stephen@networkplumber.org>
> wrote:
> 
> > On Tue, 2 Jun 2020 18:04:57 -0700
> > Ding Ma <mdyuki1016@gmail.com> wrote:
> >
> > > Hope it's the right way to ask DPDK questions. I am new to DPDK world and
> > > got an error while setting up dpdk on my server. any idea about where I
> > > should look at?
> > >
> > >
> > >    1. Error: rte_eal port num [0] is not match the pciidlist [4]
> > >    2. EAL: Error - exiting with code: 1
> > >    3.   Cause: Generate core list error
> > >
> > >
> > > Full paste:
> > > ttps://pastebin.com/zea7514Y <https://pastebin.com/zea7514Y>
> >
> > Your DPDK is built for only 32 CPU's and you have a machine with 128.
> > Change your config and move on to the next issue.
> >
> > * There are patches in review to avoid this in future versions of DPDK.
> >
>