Most Excellent!


On 10/17/16 1:35 PM, Dave Barach (dbarach) wrote:


I finally decided to quad-loop ip4-lookup, just to see what would happen. Various folks have suggested giving it a try, etc.

Note the 12 clocks/pkt improvement on a single core, with an offered load of around ~15mpps. See below for CPU details. That’s approximately a 25% performance gain. Quad-looping [only] ip4-lookup increases the ip4 racetrack forwarding NDR by something like 800 kpps.

It’s not worth retrofitting every node - even though the work is mechanical - but the ip speed path nodes are obvious candidates.

In case enquiring minds want to know... D.

vpp# sh ru

Time 3.8, average vectors/node 251.55, last 128 main loops 12.00 per node 256.00

  vector rates in 1.4877e7, out 1.4877e7, drop 0.0000e0, punt 0.0000e0

             Name Clocks       Vectors/Call

FortyGigabitEthernet84/0/1-out 7.56e0          251.55

FortyGigabitEthernet84/0/1-tx 4.79e1          251.55

dpdk-input 5.85e1          251.55

ip4-input-no-checksum 2.94e1          251.55

ip4-lookup 4.54e1          251.55

ip4-rewrite-transit 2.42e1          251.55

vpp# sh ru

Time 3.2, average vectors/node 149.42, last 128 main loops 3.09 per node 66.00

  vector rates in 1.5601e7, out 1.5601e7, drop 0.0000e0, punt 0.0000e0

             Name Clocks       Vectors/Call

FortyGigabitEthernet84/0/1-out 7.68e0          149.42

FortyGigabitEthernet84/0/1-tx 4.74e1          149.42

dpdk-input                     5.96e1          149.42

ip4-input-no-checksum 3.04e1          149.42

ip4-lookup 3.34e1          149.42

ip4-rewrite-transit 2.41e1          149.42

Thanks… Dave

$ cat /proc/cpuinfo

processor       : 31

vendor_id       : GenuineIntel

cpu family      : 6

model           : 63

model name      : Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz

stepping        : 2

microcode       : 0x27

cpu MHz         : 1201.000

cache size      : 20480 KB

physical id     : 1

siblings        : 16

core id         : 7

cpu cores       : 8

apicid          : 31

initial apicid  : 31

fpu             : yes

fpu_exception   : yes

cpuid level     : 15

wp              : yes

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid

bogomips        : 6401.16

clflush size    : 64

cache_alignment : 64

address sizes   : 46 bits physical, 48 bits virtual

power management:

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