Cpu resource is available but many run-queue from vmstat

Question

Hi, all
I coundn't find appropriate category for this system related questions.
I am sorry for this.
The system has more than 100 CPUs on a linux machine, but there are more than 10 run queues.
As you see, "r" is around 10, but "id" of cpu is about 90%.
=> I cound not understand why processes do not use OTHER available CPU resource in stead of waiting in run-queue.
uname -a
Linux aaa 2.6.18-194.el5 #1 SMP Mon Mar 29 22:10:29 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
vmstat 1 10
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
6 13      0 117346968 3604540 105912264    0    0  1013    60    0    0  6  2 90  3  0
9 14      0 117347072 3604540 105912240    0    0 27752 11759 40266 79569  4  2 89  5  0
11  7      0 117348512 3604540 105912272    0    0 36680  3085 37745 74248  5  2 89  4  0
7 16      0 117344720 3604540 105912192    0    0 27720 15913 36344 74105  4  1 89  6  0
7 13      0 117346896 3604540 105912288    0    0  9944 15803 41294 80441  6  2 88  5  0
5  9      0 117348656 3604540 105912288    0    0 11368  2051 39088 77034  5  1 89  4  0Thanks in advance.
Best Regards.

Answer 1

Thanks for your reply.
"r" is the number of processes ON CPU plus the number of processes WAITING FOR CPU.
The following is from "man vmstat".
  Procs
       r: The number of processes waiting for run time.
       b: The number of processes in uninterruptible sleep.I am confused whether or not "r" contains processes which are corrently on cpu, not in run queue.
Could you give me more detailed explaination or some article?
Thanks.
Best Regards.
Edited by: 869578 on 2013. 2. 15 오전 12:48