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* Rx-errors with testpmd (only 75% line rate)
@ 2014-01-09 19:28 Michael Quicquaro
       [not found] ` <CAAD-K97KDoGVow6dVrKdRtCyD+wgJchO4OJFpGTRDgiaq5=Stw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
  0 siblings, 1 reply; 10+ messages in thread
From: Michael Quicquaro @ 2014-01-09 19:28 UTC (permalink / raw)
  To: dev-VfR2kkLFssw@public.gmane.org; +Cc: mayhan-0C9CrKKbv28dnm+yROfE0A

Hello,
My hardware is a Dell PowerEdge R820:
4x Intel Xeon E5-4620 2.20GHz 8 core
16GB RDIMM 1333 MHz Dual Rank, x4 - Quantity 16
Intel X520 DP 10Gb DA/SFP+

So in summary 32 cores @ 2.20GHz and 256GB RAM

... plenty of horsepower.

I've reserved 16 1GB Hugepages

I am configuring only one interface and using testpmd in rx_only mode to
first see if I can receive at line rate.

I am generating traffic on a different system which is running the netmap
pkt-gen program - generating 64 byte packets at close to line rate.

I am only able to receive approx. 75% of line rate and I see the Rx-errors
in the port stats going up proportionally.
I have verified that all receive queues are being used, but strangely
enough, it doesn't matter how many queues more than 2 that I use, the
throughput is the same.  I have verified with 'mpstat -P ALL' that all
specified cores are used.  The utilization of each core is only roughly 25%.

Here is my command line:
testpmd -c 0xffffffff -n 4 -- --nb-ports=1 --coremask=0xfffffffe
--nb-cores=8 --rxd=2048 --txd=2048 --mbcache=512 --burst=512 --rxq=8
--txq=8 --interactive

What can I do to trace down this problem?  It seems very similar to a
thread on this list back in May titled "Best example for showing
throughput?" where no resolution was ever mentioned in the thread.

Thanks for any help.
- Michael

^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2014-02-10 17:34 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
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2014-01-09 19:28 Rx-errors with testpmd (only 75% line rate) Michael Quicquaro
     [not found] ` <CAAD-K97KDoGVow6dVrKdRtCyD+wgJchO4OJFpGTRDgiaq5=Stw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-09 21:21   ` François-Frédéric Ozog
2014-01-22 14:52   ` Dmitry Vyal
     [not found]     ` <52DFDB10.2090906-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-01-22 17:46       ` Wang, Shawn
2014-01-27 20:00       ` Michael Quicquaro
     [not found]         ` <CAAD-K94NjnoFwFnTdAyEyDecm6E-WTPgzaZmAeh5bAAAap8QvQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-28  8:31           ` Dmitry Vyal
     [not found]             ` <52E76AD3.9040404-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-02-10 17:34               ` Jun Han
2014-01-22 20:38   ` Robert Sanford
     [not found]     ` <CAFmpvUNHqpp0DhsFXtYQOxDObV_K5Qs2B=w7miynMADpP21C5A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-23 23:22       ` Michael Quicquaro
     [not found]         ` <CAAD-K9777Tp7tptsfXm6RbAEWJMdd6juGrthAe_MHB1U1JHfDw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-24  9:18           ` François-Frédéric Ozog

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