[dpdk-users] Issue with more Cores assigned: Cannot mmap device resource file

[Kai Zhang]

Command line:
primary:      sudo ./primary -l 0,1,2,3 -n 4 --proc-type=primary
secondary: sudo ./secondary -l 4,5,6,7,8 -n 4 --proc-type=secondary

The configurations are as follows:
A) 1 x Intel E5-2650 v4, 12 cores [UMA],     XL710 40GbE, bind 02:00.0,
 2048 x 4k huge page
02:00.0 *Ethernet* controller: Intel Corporation *Ethernet* Controller
XL710 for 40GbE QSFP+ (rev 02)  * [<<- Only bind this one]*
02:00.1 *Ethernet* controller: Intel Corporation *Ethernet* Controller
XL710 for 40GbE QSFP+ (rev 02)
05:00.0 *Ethernet* controller: Intel Corporation I210 Gigabit Network
Connection (rev 03)
06:00.0 *Ethernet* controller: Intel Corporation I210 Gigabit Network
Connection (rev 03)
        Socket 0
--------
Core 0  [0, 12]
Core 1  [1, 13]
Core 2  [2, 14]
Core 3  [3, 15]
Core 4  [4, 16]
Core 5  [5, 17]
Core 8  [6, 18]
Core 9  [7, 19]
Core 10 [8, 20]
Core 11 [9, 21]
Core 12 [10, 22]
Core 13 [11, 23]

B) 2 x Intel E5-2640 v4, 10 cores [NUMA],      No Port Bind,    2048 x 4k
huge page
05:00.0 *Ethernet* controller: Intel Corporation I210 Gigabit Network
Connection (rev 03)
06:00.0 *Ethernet* controller: Intel Corporation I210 Gigabit Network
Connection (rev 03)
        Socket 0        Socket 1
        --------        --------
Core 0  [0, 20]         [10, 30]
Core 1  [1, 21]         [11, 31]
Core 2  [2, 22]         [12, 32]
Core 3  [3, 23]         [13, 33]
Core 4  [4, 24]         [14, 34]
Core 8  [5, 25]         [15, 35]
Core 9  [6, 26]         [16, 36]
Core 10 [7, 27]         [17, 37]
Core 11 [8, 28]         [18, 38]
Core 12 [9, 29]         [19, 39]

Ah, as machine B does not have a 40GbE, I did not bind any NIC and run my
program with locally generated packets. But I am using other DPDK features,
such as memory sharing and message passing. Maybe that is the reason it
works correctly? I can only access machine B remotely, so I am unable to
install a NIC on it. I have another PC that is used as a client that only
has four cores, which also cannot be used for verification...

Regards,
Kai


On Sun, Mar 12, 2017 at 2:59 AM, Wiles, Keith <keith.wiles at intel.com> wrote:

>
> > On Mar 11, 2017, at 9:45 AM, Kai Zhang <kay21s at gmail.com> wrote:
> >
> > Hi Keith,
> >
> > Thank you for your reply.
> >
> > I have tested my program on two machines
> > A) 1 x Intel E5-2650 v4, 12 cores [UMA]
> > B) 2 x Intel E5-2640 v4, 10 cores [NUMA]
> >
> > I am very sure that the primary process uses different cores with the
> secondary process. The strange thing is that my program works correctly on
> machine B. But on machine A, the above issue happens with more than 4 cores
> assigned to the secondary process.
> >
> > I have tried to assign cores 1-5  to the secondary process and also
> tried other core assignment policies, but the error still happens
> rte_eal_init() with more than 4 cores.
>
> It would be nice to see both command lines. I am not sure I can help more
> all I can do is suggest some ideas to look at.
>
> Does machine B have the same number and type of NICs? Use ‘lspci | grep
> Ethernet’ to get a list of all Ethernet devices on both machines.
>
> What is the number of hugepages you have allocated for both machines.
>
> Also look at the cpu_layout.py script to see why adding the 5th core would
> be different on the two machines and try to make them the same.
>
> >
> > Regards,
> > Kai
> >
> > On Sat, Mar 11, 2017 at 10:52 PM, Wiles, Keith <keith.wiles at intel.com>
> wrote:
> >
> > > On Mar 10, 2017, at 9:35 PM, Kai Zhang <kay21s at gmail.com> wrote:
> > >
> > > Hi, there
> > >
> > > I am using DPDK-16.11 on XL710 40GbE NIC. OS: CentOS 7.3.1611 with
> Linux
> > > kernel version 3.8.0-30.
> > >
> > > I have a master process and a secondary process. When I run the
> secondary
> > > process with less than or equal to 4 cores, it works correctly. Such
> as:
> > > sudo ./program -l 4,5,6,7 -n 4 --proc-type=secondary
> > > sudo ./program -c 0x0f -n 4 --proc-type=secondary
> > >
> > > However, there will be error in the rte_eal_init if I assign more than
> 4
> > > cores.
> > > sudo ./program -l 0,1,2,3,4 -n 4 --proc-type=secondary
> > > sudo ./program -c 0x1f -n 4 --proc-type=secondary
> > >
> > > EAL: Cannot mmap device resource file
> > > /sys/bus/pci/devices/0000:02:00.0/resource0 to address: 0x7fff65bfc000
> > > EAL: Error - exiting with code: 1
> > >  Cause: Requested device 0000:02:00.0 cannot be used
> >
> > I assume you have at least 8 cores. Have you tried -l 1-5 on the
> secondary process.
> >
> > You did not show the primary process command line, but the if you use
> 1-5 then you can only give primary process -l 6-7 or two cores. It is
> always a reasonable thing is to leave core zero for linux to use.
> >
> > Also it could be you ran out of memory or hugepages you allocated to the
> system.
> >
> > >
> > > Anyone knows why this happens?
> > >
> > > Thanks a lot,
> > > Kai Zhang
> >
> > Regards,
> > Keith
> >
> >
>
> Regards,
> Keith
>
>