raid1 resync consuming a lot of cpu

hi guys
my raid1 server was disconected from power
and it´s starting resync...
ok no problem
i set max speed to 1MB/s
the problem is....
the CPU is waiting a lot
i don´t know if raid1 resync program is consuming my CPU with wait
eventos to ensure a 1MB/s of speed, since i don´t have anyother
process running just resync at a slow speed
could anyone check this?
at /proc/

[root@friganso log]# cat /proc/version
Linux version 2.6.26-ARCH (root@T-POWA-LX) (gcc version 4.3.1 20080724
(prerelease) (GCC) ) #1 SMP PREEMPT Sun Aug 10 14:04:12 CEST 2008

[root@friganso log]# cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sdb4[1] sda4[0]
      390074176 blocks [2/2] [UU]

md2 : active raid1 sdb3[1] sda3[0]
      68364480 blocks [2/2] [UU]
      [==>..................]  resync = 11.9% (8152768/68364480)
finish=732.5min speed=1369K/sec

md1 : active raid1 sdb2[1] sda2[0]
      29302464 blocks [2/2] [UU]

md0 : active raid1 sdb1[1] sda1[0]
      104320 blocks [2/2] [UU]

unused devices: <none>







at HTOP program what i see is this:

  1  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||1.3%]
    Tasks: 368 total, 1 running
  2  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||2.7%]
    Load average: 54.04 50.06 41.78
  3  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||1.7%]
    Uptime: 00:57:52
  4  [||||||||||||||||||
     1.8%]     Avg:  0.3% sy:  1.1% ni:  0.0% hi:  0.0% si:  0.0% wa:
73.1%
  5  [|||||||||||||||||||||||||||||
     1.4%]     Mem:16047M used:6556M buffers:0M cache:9411M
  6  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||1.1%]
    Mem[||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||6556/16047MB]
  7  [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||1.0%]
    Swp[|
 41/28615MB]
  8  [||||||||||||||||||||||||||||||
     0.7%]     Avg:  0.3% sy:  1.1% ni:  0.0% hi:  0.0% si:  0.0% wa:
73.1%


wa=73.1%!!!!! and system is veeery slow, it´s dual a xeon DELL server
model           : 23
model name      : Intel(R) Xeon(R) CPU           E5410  @ 2.33GHz
<- quad core, i have 2 cpus (physical id     : 0, physical id     : 1)

i don´t know how to get this wa(maybe waiting) cpu percentage from /proc files
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