Why host transmit rate on 1Gb ethernet is only ~750Mbps ?

[Yuri]

On 04/14/2012 12:32, Jason Leschnik wrote:
> What kind of load are you looking at when running the test?
>
> maybe output `vmstat 1 15` during a test run

Here is the log during the test run on the sending side:

# vmstat 1 15
  procs      memory      page                    disks     
faults         cpu
  r b w     avm    fre   flt  re  pi  po    fr  sr md0 ad0   in   sy   
cs us sy id
  0 9 17  32481M  1312M  3155   1   6   0  3263 430   0   0 1163 11537 
6958  4  1 95
  1 9 17  32507M  1312M   283   0   0   0    55   0   0   0 2354 163960 
8891  5  4 91
  1 9 17  32507M  1312M     4   0   0   0     0   0   0   0 5427 156936 
15139  5  3 92
  0 9 17  32507M  1312M  3436   0   0   0  2380   0   0   0 5412 211755 
16386  7  4 89
  0 9 17  32507M  1312M     4   0   0   0     0   0   0   0 5418 151530 
15159  5  3 92
  1 9 17  32495M  1321M     5   0   0   0  2380   0   0   0 5411 145787 
15047  4  3 93
  1 9 17  32495M  1321M     4   0   0   0     0   0   0   0 5492 147687 
15451  4  3 93
  0 9 17  32495M  1321M     4   0   0   0     0   0   0   0 5441 145666 
15155  4  3 92
  0 9 17  32495M  1321M   600   0   0   0     0   0   0   0 5418 147173 
15361  4  2 93
  0 9 17  32495M  1321M     7   0   0   0     0   0   0   0 5428 145410 
15122  4  3 93
  0 9 17  32495M  1321M     4   0   0   0     0   0   0   0 5427 146896 
15175  4  3 93
  1 9 17  32481M  1312M  2402   0   0   0   399   0   0  51 2629 128751 
9712  4  2 93

Yuri