On May 24, 2013, at 7:41 AM, Thomas Monjalon wrote: > Hello, > > 24/05/2013 16:11, Patrick Mahan : >> Intel Xeon E5-2690 (8 physical, 16 virtual) > > How many CPU sockets have you ? This is a Dell PowerEdge T620, it has two sockets, but only one has a CPU in it. > >> 64 Gbyte DDR3 memory >> Intel 82599EB-SPF dual port 10GE interface >> CentOS 6.4 (2.6.32-358.6.1.el6.x86_64) >> The 82599 is in a 16x PCI-e slot. > > Check the datasheet of your motherboard. > Are you sure it is wired as a 16x PCI-e ? As far as I can tell from the specs on the Dell site - www.dell.com/us/business/p/poweredge-t620/pd > Is it connected to the right NUMA node ? Yes, it's in slot labeled: PCIE_G3_x16 (cpu1). The interfaces show up as p2p1 and p2p2. > >> I have it attached to an IXIA box. I have been running the app 'testpmd' >> in iofwd mode with 2K rx/tx descriptors and 512 burst/mbcache. I have been >> varying the # of queues and unfortunately, I am not seeing full line rate. > > What is your command line ? > sudo build/app/testpmd -b 0000:03:00.0 -b 0000:03:00.1 -c -n3 -- --nb-cores= --nb-ports=2 --rxd=2048 --rxd=2048 --mbcache=512 --burst=512 --rxd= --txq= Where I am using the following to determine cores, coremask and nqueues: ncores = nqueues * 2 // this actually the number of ports being tested coremask = (1 << (ncores + 1)) - 1 So for say, 3 rx/tx queues - ncores = 3 * 2 = 6 coremask = (1 << (6 + 1)) - 1 = 127 (0x7f) Now that I remember it I had to fix testpmd to allocate enough mbufs. >> I am seeing about 20-24% droppage on the receive side. It doesn't seem to >> matter the # of queues. > > If queues are polled by different cores, it should matter. I assume you mean different physical cores, yes? There is only one physical core, but each 'forwarding' thread is on a separate core. > >> Question 1: Is 'testpmd' the best application for this type of testing? If >> not, which program? Or do I need to roll my own? > > testpmd is the right application for performance benchmark. > It is also possible to use examples l2fwd/l3fwd but you should keep testpmd. I am just starting with testpmd to get a feel for raw throughput. I want to test l2 and l3 soon but I may loose access to the Ixia. > >> Question 2: I have blacklisted the Intel i350 ports on the motherboard and >> am using ssh to access the platform. Could this be affecting the test? > > You mean i350 is used for ssh ? It shouldn't significantly affect your test. Okay, I noticed that they scanned by the pci dpdk layer. Thanks, Patrick > > -- > Thomas