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Date: Tue, 17 Feb 2015 16:35:41 +0000
From: Bruce Richardson <bruce.richardson@intel.com>
To: Jeff Wang <fatjeffw@gmail.com>
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Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] testpmd app issues
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On Tue, Feb 17, 2015 at 09:31:33AM -0700, Jeff Wang wrote:
> Hi,
> 
> I'm new to DPDK.
> 
> I have gone through the user guide, set up environment, hugepages. I can
> get the helloworld app work. Now, when I tried to play with the testpmd
> app, I got the following issue:
> 
> [root@localhost dpdk-1.8.0]# build/app/testpmd -c 0x2 -n1 -- -i
> --nb-cores=1 --nb-ports=0x1
> 
> .....
> 
> EAL: TSC frequency is ~2594110 KHz
> EAL: Master core 1 is ready (tid=e07b3840)
> PMD: ENICPMD trace: rte_enic_pmd_init
> EAL: PCI device 0000:02:00.0 on NUMA socket -1
> EAL:   probe driver: 8086:10d3 rte_em_pmd
> EAL:   0000:02:00.0 not managed by UIO driver, skipping
> EAL: PCI device 0000:03:00.0 on NUMA socket -1
> EAL:   probe driver: 8086:10d3 rte_em_pmd
> EAL:   PCI memory mapped at 0x7f06df800000
> EAL:   PCI memory mapped at 0x7f06df820000
> PMD: eth_em_dev_init(): port_id 0 vendorID=0x8086 deviceID=0x10d3
> EAL: PCI device 0000:04:00.0 on NUMA socket -1
> EAL:   probe driver: 8086:10d3 rte_em_pmd
> EAL:   0000:04:00.0 not managed by UIO driver, skipping
> EAL: PCI device 0000:05:00.0 on NUMA socket -1
> EAL:   probe driver: 8086:10d3 rte_em_pmd
> EAL:   0000:05:00.0 not managed by UIO driver, skipping*PANIC in main():
> Empty set of forwarding logical cores - check the core mask supplied
> in the command parameters*
> 5: [build/app/testpmd() [0x428ea5]]
> 4: [/lib64/libc.so.6(__libc_start_main+0xf5) [0x7f06df8e2af5]]
> 
> .....
> 
> It says the core mask is not right. I set it to 0x2 because my CPU
> only has 2 cores. I don't quite get it.
> 
> Can someone help me with this? And has anyone else encountered the same issue?
> 
> Thanks!

Hi,

a coremask of 2 means to use only the second core (i.e. core 1, but not core 0).
Since the coremask is a bitmask, to use two cores you need to specify 0011b, or
"3" decimal/hex.

Regards,
/Bruce