[dpdk-dev] Performances are not scale with multiple ports
Shinae Woo
shinae2012 at gmail.com
Tue May 28 04:26:30 CEST 2013
Hello, all.
I play the dpdk-1.2.3r1 with examples.
But I can not achieve the line-rate packet receive performance,
and the performance is not scale with multiple ports.
For example, in example l2fwd, I have tested two cases with 2 ports, and 4
ports,
using belowed command line each
./build/l2fwd -cf -n3 -- -p3
./build/l2fwd -cf -n3 -- -pf
But both cases, the aggregated performance are not scale.
== experiments environments ==
- Two Intel 82599 NICs (total 4 ports)
- Intel Xeon X5690 @ 3.47GHz * 2 (total 12 cores)
- 1024 * 2MB hugepages
- Linux 2.6.38-15-server
- Each ports receiving 10Gbps of traffic of 64 bytes packets, 14.88Mpps.
*1. Packet forwarding performance*
In 2 ports case, receive performance is 13Mpps,
In 4 ports case, not 26Mbps, only 16.8Mpps.
Port statistics ====================================
Statistics for port 0 ------------------------------
Packets sent: 4292256
Packets received: 6517396
Packets dropped: 2224776
Statistics for port 1 ------------------------------
Packets sent: 4291840
Packets received: 6517044
Packets dropped: 2225556
Aggregate statistics ===============================
Total packets sent: 8584128
Total packets received: 13034472
Total packets dropped: 4450332
====================================================
Port statistics ====================================
Statistics for port 0 ------------------------------
Packets sent: 1784064
Packets received: 2632700
Packets dropped: 848128
Statistics for port 1 ------------------------------
Packets sent: 1784104
Packets received: 2632196
Packets dropped: 848596
Statistics for port 2 ------------------------------
Packets sent: 3587616
Packets received: 5816344
Packets dropped: 2200176
Statistics for port 3 ------------------------------
Packets sent: 3587712
Packets received: 5787848
Packets dropped: 2228684
Aggregate statistics ===============================
Total packets sent: 10743560
Total packets received: 16869152
Total packets dropped: 6125608
====================================================
*2. Packet receiving performance*
I fix the codes for only receiving packets (not forwarding),
the performance is still not scalable as each 13.3Mpps, 18Mpps.
Port statistics ====================================
Statistics for port 0 ------------------------------
Packets sent: 0
Packets received: 6678860
Packets dropped: 0
Statistics for port 1 ------------------------------
Packets sent: 0
Packets received: 6646120
Packets dropped: 0
Aggregate statistics ===============================
Total packets sent: 0
Total packets received: 13325012
Total packets dropped: 0
====================================================
Port statistics ====================================
Statistics for port 0 ------------------------------
Packets sent: 0
Packets received: 3129624
Packets dropped: 0
Statistics for port 1 ------------------------------
Packets sent: 0
Packets received: 3131292
Packets dropped: 0
Statistics for port 2 ------------------------------
Packets sent: 0
Packets received: 6260908
Packets dropped: 0
Statistics for port 3 ------------------------------
Packets sent: 0
Packets received: 6238764
Packets dropped: 0
Aggregate statistics ===============================
Total packets sent: 0
Total packets received: 18760640
Total packets dropped: 0
====================================================
The question is that
1. How I can achieve each port receiving full 14.88Mpps ?
What might be the bottleneck in current environment?
2. Why the performance using multiple ports is not scale?
I guess doubling ports shows the doubling the receiving performance,
but it shows not. I am curious about what is limiting the packet
receivng performance.
Thanks,
Shinae
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