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From: Tomasz K <tomasz.kasowicz@gmail.com>
Date: Wed, 7 May 2014 16:56:22 +0200
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To: "Burakov, Anatoly" <anatoly.burakov@intel.com>
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Subject: Re: [dpdk-dev] DMAR errors when running testpmd
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Hi Anatoly

I'm using dpdk-1.6.0r2 on Ubuntu 12.04 LTS with kernel 3.11.0-20-generic
#35~precise1-Ubuntu SMP

As for further investigation:
1. It doesn't matter whether DPDK uses 1GB or 2MB hugepages.
2. dmesg messages appear only when I invoke "start tx_first" in testpmd app
(so only when I try to send some packets)

The setup is very easy. 2 NICs connected with each other (port0 on NIC1 to
port0 on NIC2, same for port1). Each NIC iis on different server

Thanks
Tomasz


2014-05-07 16:45 GMT+02:00 Burakov, Anatoly <anatoly.burakov@intel.com>:

> Hi Tomasz,
>
> >
> > Here lies your mistake :-) Boot your kernel with iommu to "pt" (iommu=pt
> > intel_iommu=on) and everything will work. Thje "pt" option enables IOMMU
> > only for VM's while "on" sets up your whole system to work through IOMMU
> > (including host devices). However, both of these options enable SR-IOV.
> >
>
> Apologies, I misread your command-line output. It seems like you have
> everything set up correctly. I'm not sure what is wrong here, but the
> messages you're seeing are usually related to incorrect IOMMU boot
> parameters. Which DPDK version are you using?
>
> Best regards,
> Anatoly Burakov
> DPDK SW Engineer
>
>
>
>