Re: [dpdk-users] [dpdk-dev] Nehalem Intel Xeon X5506 architecture and PCIe NIC association to Numa node

[Victor Huertas <vhuertas@gmail.com>]

Bruce,

With igb_uio it happens the same:

Network devices using DPDK-compatible driver
============================================
0000:04:00.0 '82576 Gigabit Network Connection 10c9' drv=igb_uio
unused=vfio-pci
0000:04:00.1 '82576 Gigabit Network Connection 10c9' drv=igb_uio
unused=vfio-pci

Network devices using kernel driver
===================================
0000:02:00.0 '82572EI Gigabit Ethernet Controller (Copper) 107d' if=eth1
drv=e1000e unused=igb_uio,vfio-pci *Active*

Even I have linked the rte libs with the flag --whole-archive flag (I found
somewhere in google that this solved a similar problem) but with no result.

All the output I get when I run the app (it is the l3fwd-acl example) is
what you see below:

cuda1@cuda1:~/git/dpdk-stable> sudo
/home/cuda1/eclipse-workspace/DPDK_Test/Debug/DPDK_Test -c 0x0f -n 2 -- -p
0x3
EAL: Detected 8 lcore(s)
EAL: Probing VFIO support...
EAL: VFIO support initialized
port 0 is not present on the board
EAL: Error - exiting with code: 1
  Cause: check_port_config failed


2018-02-09 12:27 GMT+01:00 Bruce Richardson <bruce.richardson@intel.com>:

> Moving to users list, since that is more relevant than dev.
>
> On Thu, Feb 08, 2018 at 07:36:30PM +0100, Victor Huertas wrote:
> > Bruce,
> >
> >
> > My requirements are not that much (500 Mbps and 1 Gbps desirable).
> >
> >
> > Thanks for your references links I will have a look at them.
> >
> >
> > Regarding the NIC detection in the DPDK app by the DPDK EAL
> initialization
> > after successfully having loaded the vfio-pci, it happens something
> strange.
> >
> > The nb_ports = rte_eth_dev_count(); is always returning 0.
> >
> >
> > Therefore it shows an error telling that "port 0 is not present on the
> > board".
> >
> >
> > The EAL seems to detect the VFIOs as the only two logs that shows when
> > initializing regarding VFIO are:
> >
> >
> > EAL: Probing VFIO support...
> >
> > EAL: VFIO support initialized
> >
> >
> > And nothing else... shouldn't the EAL detect the two NICs I associated to
> > the VFIO? very strange...
> >
> >
>
> Yes, it should. Can you please send full output on startup.
> Also, can you try using igb_uio module instead of vfio and see if that
> works for you.
>
> Regards,
> /Bruce
>
> > Regards,
> >
> >
> > PD: I have changed the email address account in order to avoid sending
> > these disturbing disclaimers. Sorry.
> >
> >
> > -----Mensaje original-----
> > De: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > Enviado el: jueves, 08 de febrero de 2018 17:42
> > Para: Huertas García, Víctor
> > CC: dev@dpdk.org
> > Asunto: Re: [dpdk-dev] Nehalem Intel Xeon X5506 architecture and PCIe NIC
> > association to Numa node
> >
> >
> >
> > On Thu, Feb 08, 2018 at 04:27:36PM +0000, Huertas García, Víctor wrote:
> >
> > >
> >
> > > Hi all,
> >
> > >
> >
> > > After having tried many ways to make the PCIe NIC card appear
> associated
> > to a numa node, I haven't been able to do it.
> >
> > > That is, every time I try to look at which numa node belongs it always
> > returns -1.
> >
> > >
> >
> > > $ cat /sys/bus/pci/devices/0000\:04\:00.1/numa_node
> >
> > > -1
> >
> > >
> >
> > > $ cat /sys/bus/pci/devices/0000\:04\:00.0/numa_node
> >
> > > -1
> >
> > >
> >
> > > Using lstopo, I confirm that all PCI cards are "outside" of  any Numa
> > node.
> >
> > >
> >
> > > I have read in previous posted messages in dpdk-dev community that this
> > is normal in Nehalem generation Xeon architecture and there is nothing I
> > can do about it. Can somebody confirm this?
> >
> >
> >
> > For that generation architecture, it is indeed expected. The NICs are not
> > directly connected to any NUMA node.
> >
> >
> >
> > > If so, what implications could this have on packet capture and
> > performance?
> >
> >
> >
> > Unsurprisingly, it's the case that newer platforms will perform better,
> as
> > you are missing out on performance benefits from improved cores and also
> > features like Intel® DDIO [1].
> >
> > However, what I/O throughput are you hoping to get from your system?
> >
> > Depending on your requirements, what you have may be enough. Some people
> > use DPDK on lower-end platforms because that is all that they need. You
> may
> > also find the chart on slide 6 of [2] of use to see how the max
> throughput
> > of a platform has improved over time (and has improved further since that
> > chart was published).
> >
> >
> >
> > >
> >
> > > Are the NICs available in my DPDK applications? Do I have to
> specifically
> > "add" them by "-w 04:00.1 - w 04:00.0"?
> >
> >
> >
> > Yes, your NICs will still be available, even without NUMA affinity, and
> no,
> > you should not need to explicitly whitelist them - though you can if you
> > want. So long as they are bound to a uio or vfio driver (e.g.
> >
> > igb_uio or vfio-pci), they should be detected by DPDK EAL init and made
> > available to your app.
> >
> >
> >
> > > Is RSS supported and usable from the DPDK application?
> >
> >
> >
> > Yes, at least for Intel NICs, and probably most other DPDK-supported NICs
> > too.
> >
> >
> >
> > >
> >
> > > Thanks a lot for your attention
> >
> > >
> >
> > > Victor
> >
> > >
> >
> >
> >
> > /Bruce
> >
> >
> >
> > [1] https://www.intel.com/content/www/us/en/io/data-direct-i-o-t
> > echnology.html
> >
> > [2] https://dpdksummit.com/Archive/pdf/2016Germany/DPDK-2016-
> > DPDK_FD_IO_Introduction.pdf
> >
> >
> >
> > PS: This is a public list, so email disclaimers are rather pointless.
> >
> > It's best if they can be removed from mails sent here.
> >
> >
> >
> >
> > --
> > Victor
>



-- 
Victor