Re: [dpdk-users] Hard Crash with X710 and Pktgen

[James Bensley <jwbensley@gmail.com>]

On 14 November 2017 at 10:59, Johnson, Brian <brian.johnson@intel.com> wrote:
> Do you have Intel VT-d enabled in the BIOS and intel_iommu=on iommu=pt in
> grub?
...
> Once the system boots up, check the contents of /sys/kernel/iommu_groups/
> directory. If it is non-empty, you have successfully set up IOMMU.

Hi Brian,

Many thanks for your response!

$ ls  /sys/kernel/iommu_groups/
0  1  10  11  12  13  14  15  16  17  18  19  2  20  21  22  23  24
25  26  27  28  29  3  30  31  32  33  34  35  36  37  38  39  4  40
41  5  6  7  8  9

There is "stuff" in there so, looks good to me.

$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.13.12-1.el7.elrepo.x86_64
root=UUID=e5b08dc0-3ea6-4259-82ab-820dee91fa52 ro intel_pstate=disable
iommu=pt intel_iommu=on default_hugepagesz=1G hugepagesz=1G
hugepages=4 crashkernel=auto rhgb quiet

$ dmesg | grep -i IOMMU
[    0.000000] DMAR: IOMMU enabled

VT-x is enabled:
$ grep -m 1 -o "vmx" /proc/cpuinfo
vmx

VT-d is enabled:
$ dmesg | grep -i DMAR
[    0.000000] DMAR: IOMMU enabled

Cheers,
James.