Re: Best example for showing throughput?

[Thomas Monjalon <thomas.monjalon-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>]

Hello,

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.  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 testpmd.

> 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.

-- 
Thomas