From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Monjalon Subject: Re: Best example for showing throughput? Date: Fri, 24 May 2013 17:45:25 +0200 Message-ID: <201305241745.25844.thomas.monjalon@6wind.com> References: <519F74F6.3000903@mahan.org> <201305241641.38896.thomas.monjalon@6wind.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: dev-VfR2kkLFssw@public.gmane.org To: Patrick Mahan Return-path: In-Reply-To: <201305241641.38896.thomas.monjalon-pdR9zngts4EAvxtiuMwx3w@public.gmane.org> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org Sender: "dev" 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 > 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