[dpdk-dev] Rx-errors with testpmd (only 75% line rate)
Michael Quicquaro
michael.quicquaro at gmail.com
Thu Jan 9 20:28:00 CET 2014
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
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