[dpdk-dev] Best example for showing throughput?
thomas.monjalon at 6wind.com
Fri May 24 17:45:25 CEST 2013
Adding other questions about packet generator:
24/05/2013 16:41, Thomas Monjalon :
> 24/05/2013 16:11, Patrick Mahan :
> > Intel Xeon E5-2690 (8 physical, 16 virtual)
> How many CPU sockets have you ?
> > 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 ?
> Is it connected to the right NUMA node ?
> > I have it attached to an IXIA box.
Which packet size are you sending with your packet generator ?
In case of 64 byte packets (with Ethernet CRC), (64+20)*8 = 672 bits.
So line rate is 10000/672 = 14.88 Mpps.
This bandwith should be supported by your 82599 NIC.
Are you sending and receiving on the 2 ports at the same time ?
Forwarding in the 2 directions is equivalent to double the bandwidth.
Maybe that 14.88*2 = 29.76 Mpps is too much for your hardware.
You could also try with 2 ports on 2 different NICs.
> > 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 ?
> > 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.
> > 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
> > 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
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