Fwd: NFS , Kjournald - status D (uninterruptible sleep) - maquina lenta.

[Denis <denismpa@gmail.com>]

Dears, I've got a double dual xeon wich sometimes is getting too slow.


While i was observing one of these slowly times, I realized the time
wait of processors come close to 100% and nfsd and kjournald process
become to D status (uniterruptible sleep) .Does someone know why this
can be happening or how can I troubleshoot it?

Below is a 'draw' of my top at one of these moments.

[root@cromo src]# top
top - 10:59:02 up 6 days, 19:30, 17 users,  load average: 14.77, 13.46, 13.00
Tasks: 189 total,   1 running, 188 sleeping,   0 stopped,   0 zombie
Cpu0  :  0.0% us,  0.4% sy,  0.0% ni,  0.2% id, 98.5% wa,  0.0% hi,  0.9% si
Cpu1  :  0.0% us,  0.4% sy,  0.0% ni,  0.0% id, 99.6% wa,  0.0% hi,  0.0% si
Cpu2  :  0.0% us,  0.2% sy,  0.0% ni,  7.8% id, 92.0% wa,  0.0% hi,  0.0% si
Cpu3  :  0.2% us,  0.8% sy,  0.0% ni,  0.0% id, 98.7% wa,  0.2% hi,  0.0% si
Mem:   4025540k total,  4018264k used,     7276k free,     7908k buffers
Swap:  4096564k total,     3288k used,  4093276k free,  3553252k cached

 3941 root      15   0     0    0    0 D    2  0.0  80:29.30 nfsd
 3938 root      15   0     0    0    0 D    1  0.0  81:02.02 nfsd
 2459 root      15   0     0    0    0 D    1  0.0  30:57.04 kjournald
 3937 root      15   0     0    0    0 D    1  0.0  82:07.99 nfsd
   96 root      15   0     0    0    0 S    0  0.0  34:12.48 kswapd0
 3940 root      15   0     0    0    0 D    0  0.0  80:22.55 nfsd
 3942 root      15   0     0    0    0 D    0  0.0  80:23.66 nfsd
 3939 root      15   0     0    0    0 D    0  0.0  82:22.55 nfsd
 4283 root      16   0 20936 8136 1276 S    0  0.2   0:44.47 hald
21289 denismpa  16   0  6280 1092  776 R    0  0.0   0:00.12 top
    1 root      16   0  4752  552  460 S    0  0.0   0:01.28 init
    2 root      RT   0     0    0    0 S    0  0.0   0:00.21 migration/0
    3 root      34  19     0    0    0 S    0  0.0   0:00.05 ksoftirqd/0
    4 root      RT   0     0    0    0 S    0  0.0   0:00.28 migration/1
    5 root      34  19     0    0    0 S    0  0.0   0:00.09 ksoftirqd/1
    6 root      RT   0     0    0    0 S    0  0.0   0:00.15 migration/2
    7 root      34  19     0    0    0 S    0  0.0   0:00.05 ksoftirqd/2
    8 root      RT   0     0    0    0 S    0  0.0   0:00.15 migration/3
    9 root      34  19     0    0    0 S    0  0.0   0:00.06 ksoftirqd/3
   10 root       5 -10     0    0    0 S    0  0.0   0:01.01 events/0
   11 root       5 -10     0    0    0 S    0  0.0   0:00.11 events/1
   12 root       5 -10     0    0    0 S    0  0.0   0:00.06 events/2
   13 root       5 -10     0    0    0 S    0  0.0    0:00.12 events/3
   14 root       5 -10     0    0    0 S    0  0.0   0:00.00 khelper
   15 root      15 -10     0    0    0 S    0  0.0   0:00.00 kacpid
   63 root       5 -10     0    0    0 S    0  0.0   0: 00.00 kblockd/0
   64 root       5 -10     0    0    0 S    0  0.0   0:00.00 kblockd/1
   65 root       5 -10     0    0    0 S    0  0.0   0:00.00 kblockd/2
   66 root       5 -10     0    0    0 S    0  0.0   0: 00.00 kblockd/3
   67 root      15   0     0    0    0 S    0  0.0   0:00.06 khubd
   97 root      12 -10     0    0    0 S    0  0.0   0:00.00 aio/0
   98 root       5 -10     0    0    0 S    0  0.0   0:00.00 aio/1
   99 root       5 -10     0    0    0 S    0  0.0   0:00.00 aio/2
  100 root       5 -10     0    0    0 S    0  0.0   0:00.00 aio/3
  244 root      23   0     0    0    0 S    0  0.0   0:00.00 kseriod
  359 root      20   0     0    0    0 S    0  0.0   0:00.00 scsi_eh_0
  360 root      15   0     0    0    0 S    0  0.0   0:00.00 aacraid
  379 root       5 -10     0    0    0 S    0  0.0   0:00.00 ata/0
  380 root       5 -10     0    0    0 S    0  0.0   0: 00.00 ata/1
  381 root       5 -10     0    0    0 S    0  0.0   0:00.00 ata/2
  382 root       8 -10     0    0    0 S    0  0.0   0:00.00 ata/3
  388 root      20   0     0    0    0 S    0  0.0   0:00.00 scsi_eh_1
  389 root      21   0     0    0    0 S    0  0.0   0:00.00 scsi_eh_2
  403 root      15   0     0    0    0 D    0  0.0   0:03.87 kjournald
 1708 root       6 -10  3604  444  364 S    0  0.0   0:00.00 udevd


Thanks and regards
 --
Denis Anjos.
Cisco Certified Network Associate.
Universidade Federal do ABC
Santo André - SP - BR
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