[dpdk-dev] Cannot run l3fwd with the problem of " nb_tx_queues"

[yuxuan zhang]

  Hi,
The problem is that E1000 NIC only support 1 TX queue ,the dpdk will change
the max TX queue number in eth_em_infos_get() function the when you call
the rte_eth_dev_configure() function .If you want to run l3fwd program on
e1000 NIC correctly, you should modify the l3fwd by using only one TX queue
per lcore.


2013/11/27 Jose Gavine Cueto <pepedocs at gmail.com>

> Hi yuxuan,
>
> Yes, by experience I've successfully run dpdk with a virtualbox vm using an
> e1000 NIC.  I'm not totally sure about the capabilities of the e1000 NIC
> but based on the error you've mentioned, it seems that it can only support
> 1 TX queue.
>
> "Now, I can use only one logic core to run the app and the performance of
> l3fwd is undesirable."
>
>  This shows that dpdk can run successfully with 1 TX queue only because
> probably your e1000 NIC only supports 1 queue.
>
> Cheers,
> Pepe
>
>
> On Wed, Nov 27, 2013 at 6:58 PM, Zachary.Jen (º†ã뺲) : 6305 <
> Zachary.Jen at cas-well.com> wrote:
>
> > Hi,
> >
> > I also have the same question in l3fwd example.
> > I guess may DPDK don't support the chip-set so that we got this error
> msg.
> >
> > In my system, I have 2 kinds of chip-set, 82580 & 82574L.
> > If I use l3fwd -c 3 -n 1 -- -p 3 --config '(0,0,0),(1,0,1)' in 82574L,
> > it will get the error msg.
> > But when I change my card with 82580 and use the same command to execute
> > DPDK l3fwd.
> > It's working.
> >
> > So, maybe the root cause is the DPDK does not support your chip-set and
> > send out this error msg.
> >
> > On 11/14/2013 04:31 PM, Jose Gavine Cueto wrote:
> > > Hi,
> > >
> > > Your nic (port 0) is capable of 1 txq only see error:
> > >
> > > " port_id=0 nb_tx_queues=2 > 1"
> > >
> > > I think that caused the error.
> > >
> > > Cheers,
> > > Pepe
> > >
> > >
> > > On Thu, Nov 14, 2013 at 1:21 PM, yuxuan zhang <zhangyuxuanxd at gmail.com
> > >wrote:
> > >
> > >>   Hi Everyone:
> > >>
> > >> I meet a problem with running the DPDK1.3 example l3fwd in the
> VMware. I
> > >> have two 82545EM NIC to run the l3fwd and the OS is Cent6.4. But l3fwd
> > >> cannot be configured port correctly .I start the l3fwd with following
> > >> command:
> > >>
> > >>      ./build/l3fwd  -c 0x3 -n 2 -- -p 0x3 --config="(0,0,0),(1,0,1)"
> > >>
> > >> However, I get following errors with debug info:
> > >>
> > >>      Initializing port 0 ... Creating queues: nb_rxq=1 nb_txq=2...
> PMD:
> > >> rte_eth_dev_configure: ethdev     port_id=0 nb_tx_queues=2 > 1
> > >>      EAL: Error - exiting with code: 1
> > >>      Cause: Cannot configure device: err=-22, port=0
> > >>
> > >> And I have known that the reason for this problem produced in the
> > >> **rte_eth_dev_configure function**. However, I do not kown how to fix
> > it.
> > >>
> > >> I would really appreciate If someone could provide some help to solve
> > this
> > >> issue.
> > >>
> > >
> > >
> >
> > --
> > Best Regards,
> > Zachary
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>
>
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