Hi Desh > -----Original Message----- > From: Deshvanth Mirle Jayaprakash (dmirleja) [mailto:dmirleja at cisco.com] > Sent: Friday, October 17, 2014 3:58 PM > To: Zhang, Helin; dev at dpdk.org > Subject: Re: Issues running Ethtool on KNI interfaces > > Hi Helin, > > We have been using KNI application to create Virtual interfaces. We would > like to use KNI interfaces for control plane application only. As intended, > We are > still planning to use UIO interfaces to pass Data plane traffic which would > bump > up traffic throughput. We have assigned 4 vCPUs for KNI application (CoreMask > is 0x1E (Core 1,2,3, and 4)). When I run top while KNI process is running in > the > background, see there is 100% CPU utilization on all 4 Cores. Yes, all user space threads are 100% utilized in DPDK, including KNI user space threads. I guess somebody is thinking of a good solution for this issue, but for now, it is what we can expected.
> > Is there a way to fix this or is this expected? In our case, the CPU > utilization > seems to cause lot of issues wrt to other processes running on Linux OS. Am I > missing any EAL option in KNI.Also, I was wondering If there is a way to run > KNI > without Hugepages. See my answer above, KNI user space app is actually a special DPDK application, it is based on all DPDK technologies, including hugepages. > > The Command: > > ./kni -c 0x1E -n 4 --socket-mem 512 -- -p 0x3 --config="(0,1,3),(1,2,4)" & > > Thanks, > Desh > > There is some issue with respect to Hugepage allocation that prevents other > processes from On 10/13/14 12:46 AM, "Zhang, Helin" > <helin.zhang at intel.com> wrote: > > >Hi Desh > > > >Actually KNI provide a path to exchange info/actions between user space > >and kernel space. You can read kni example application and KNI kernel > >module and KNI library for more details. It already supports setting > >MTU, link up/down the port, etc. > > > >Regards, > >Helin > > > >> -----Original Message----- > >> From: Deshvanth Mirle Jayaprakash (dmirleja) > >> [mailto:dmirleja at cisco.com] > >> Sent: Monday, October 13, 2014 3:39 PM > >> To: Zhang, Helin; dev at dpdk.org > >> Subject: Re: Issues running Ethtool on KNI interfaces > >> > >> Thanks Helin, have been trying this for some time, Is there any other > >>way I can pass IOCTLs to IGB-UIO interfaces. Can I use /dev/uio0 and > >>/dev/uio1 ? > >>Can I > >> use IOCTLS on these references in Kernel to gather interface > >>statistics, set MTU or bring up/down UIO interfaces. > >> > >> /Desh > >> > >> On 10/13/14 12:34 AM, "Zhang, Helin" <helin.zhang at intel.com> wrote: > >> > >> >Hi Desh > >> > > >> >You tried to use ethtool for KNI interfaces in VM, right? I don't > >> >think it is supported in VM. > >> >Currently it just supports ethtool for KNI interfaces in host for > >> >some igb and ixgbe NICs. > >> > > >> >Regards, > >> >Helin > >> > > >> >> -----Original Message----- > >> >> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Deshvanth > >> >> Mirle Jayaprakash (dmirleja) > >> >> Sent: Monday, October 13, 2014 3:21 PM > >> >> To: dev at dpdk.org > >> >> Subject: [dpdk-dev] Issues running Ethtool on KNI interfaces > >> >> > >> >> Hi, > >> >> > >> >> Hypervisor: KVM > >> >> > >> >> VM: Linux OS with 2.6.32 Kernel > >> >> > >> >> VM Settings: > >> >> > >> >> 8 vCPUs, 8192 MB of memory, CPU Configuration: Copy Host CPU > >> >> Config (SandyBridge), Manually set CPU topology: Sockets=2, > >> >> Cores=4, > >> >> Threads=1 > >> >> > >> >> 10Gigi Passthrough Interfaces attached to VM: Intel X520 > >> >> > >> >> > >> >> DPDK settings: > >> >> > >> >> > >> >> DPDK Version: 1.6R2 > >> >> > >> >> > >> >> echo 512 > > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages > >> >> > >> >> rmmod ixgbe > >> >> > >> >> insmod igb_uio.ko > >> >> > >> >> mkdir /mnt/hugepages > >> >> > >> >> mount -t hugetlbfs nodev /mnt/hugepages > >> >> > >> >> #./igb_uio_bind.py --status > >> >> > >> >> #./igb_uio_bind.py --bind=igb_uio 03:01.0 > >> >> > >> >> #./igb_uio_bind.py --bind=igb_uio 03:02.0 > >> >> > >> >> #./igb_uio_bind.py --status > >> >> > >> >> modprobe hwmon > >> >> > >> >> insmod rte_kni.ko > >> >> > >> >> ./kni -c 0x1E -n 2 --socket-mem 512 -- -p 0x3 > >> >>--config="(0,1,3),(1,2,4)" & > >> >> > >> >> > >> >> Having KNI process running in the background, creates two KNI > >> >>interfaces called vEth0 and vEth1 which corresponds to IGB-UIO > >> >>interfaces attached to the Userspace. The issue is that the > >> >>Ethtool doesn't work with KNI interfaces. > >> >> Is there anything that I am missing, How can I get Ethtool to work > >> >>with KNI interfaces? Also, If I do not use --socket-mem OR -m EAL > >> >>option, KNI application consumes all the huge pages(It doesn't > >> >>mater > >> >>512/4096) assigned in the very first step.Is that expected behavior? > >> >>Can I get KNI to work without assigning any Hugepages? > >> >> > >> >> > >> >> > >> >> Also, I have attached screen shots of KNI log file. Please take a > >>look. > >> >> > >> >> > >> >> Thanks, > >> >> > >> >> Desh > > Regards, Helin
