Deep dive into Kernel

From DPDK-dev mailling list Relationship between H/W ring and S/W ring I`m reading the ixgbe code especially about H/W ring and S/W ring. Is the relationship between H/W ring and S/W ring one-to-one mapping? As far as I know, H/W ring size is determined in the code(hard coded) while S/W ring size is determined in port configuration time. In the ixgbe_rx_alloc_bufs function, H/W ring header addre..

DPDK build- disable CONFIG_RTE_MBUF_SCATTER_GATTER, CONFIG_RTE_LIBRTE_IP_FRAG, CONFIG_RTE_LIBRTE_DISTRIBUTOR config## Compile librte_ip_frag#CONFIG_RTE_LIBRTE_IP_FRAG=nCONFIG_RTE_LIBRTE_IP_FRAG_DEBUG=nCONFIG_RTE_LIBRTE_IP_FRAG_MAX_FRAG=4CONFIG_RTE_LIBRTE_IP_FRAG_TBL_STAT=n ## Compile the distributor library#CONFIG_RTE_LIBRTE_DISTRIBUTOR=n cf) in DPDK 1.7, RTE_MBUF_SCATTER_GATTER is not available..

DPDK OVS will be best choice for high performance VM instead of SR-IOV.Since it can do:- Live migration- use less hugepage- can receive multlple mac addresses (VF can only receive limited mac address since PF has limited l2 switch hardware) Build Trouble shooting/root/opensource/dpdk/x86_64-ivshmem-linuxapp-gcc/lib/librte_eal.so: undefined reference to `rte_mempool_lookup'/root/opensource/dpdk/x..

DPDK receive performance Atom C2758 and E5-2609 core has same clock speed 2.4GHz.But the receiving performance has difference values, since Atom has much cache-misses. L2 Forwarding Performance BaremetalVM(IOMMU)VM(No IOMMU)VhostXeon(E5-2609 @ 2.4 GHz)13.66 Mpps(9179 Mbps) 7.46 Mpps(4777 Mbps)13.57 Mpps(9122 Mbps) Atom(C2758 @ 2.41GHz)9.78 Mpps(6576 Mbps) 9.63 Mpps(6476 Mbps)* SR-IOV w/o IOMMU (..

FreeBSD report:http://unix.derkeiler.com/Mailing-Lists/FreeBSD/net/2012-10/msg00095.html- link status 는 못찾는데 동작은 함 bug report:http://permalink.gmane.org/gmane.comp.networking.dpdk.devel/857 FreeBSD IXGBE pf driver 의 경우ix0: flags=8843 metric 0 mtu 1500 options=8407bb ether a0:36:9f:13:82:a8 nd6 options=29 media: Ethernet autoselect (10Gbase-Twinax ) status: active ethtool shows difference autoneg..

XL710QDA2 (40G Ethernet card) x 2식 ($940 x 2 = $1880) 참조: http://www.colfaxdirect.com/store/pc/viewPrd.asp?idproduct=2232&idcategory=6 XLDACBL1 (QSFP+ Twinaxial Cable, 1 Meter) x 4식 ($128 x 4 = $512)http://www.colfaxdirect.com/store/pc/viewPrd.asp?idproduct=2235&idcategory=2

########### Trying to set two addresses to map the second region results in a startup error: root at ovdk1:/usr/src/dpdk-ovs# ./openvswitch/datapath/dpdk/build/ovs_dpdk -c 0x0f -n 4 --proc-type=primary --base-virtaddr=0x7f0f80000000,0x7f0e40000000 --socket-mem 2048,2048 -- -p 0x03 -h 2 --stats=1 --client_switching_core=1 --config="(0,0,2),(1,0,3)" EAL: invalid parameter for --base-virtaddr Usage..

https://www.usenix.org/sites/default/files/conference/protected-files/nsdi14_slides_hwang.pdf

High-Performance Networking Leveraging the DPDK and the Growing Community High Performance Networking Leveraging the DPDK and Growing Community from 6WIND

commit c033f1a052e009f60f99ae729be3c23dfb1cba20Author: Choonho Son Date: Fri Jul 25 20:16:13 2014 +0900 examples/multi_process/simple_mp rte_ring_dequeue in a secondary thread should dequeue send_ring instead of recv_ring, since primary and secondary threads share same rte_ring. This is also an answer for http://dpdk.org/ml/archives/dev/2013-November/000704.html diff --git a/examples/multi_proce..