FYI: Disruptive IP Networking with Intel DPDK on Linux http://slidesha.re/SeVFZo
On Tue, 28 May 2013 11:26:30 +0900 Shinae Woo <shinae2012 at gmail.com> wrote: > 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 -- SAKURA Internet Inc. / Senior Researcher Naoto MATSUMOTO <n-matsumoto at sakura.ad.jp> SAKURA Internet Research Center <http://research.sakura.ad.jp/>
