very high wait rates @pe2600

rico reichenberg reichenberg at ksu-soft.de
Sat Oct 30 21:52:08 CDT 2004


hello

for example:
i copy a 3gb file from sdc1 -> sdb1
the wait rates in top are very high. til 90%.
vmstat shows 0-30.

how can i found out why wait is so high?

another problem:
used swap is 700mb???

why is so much swap used?
which command tells me which process is swapped out?

thx for your help!!
rico

below my configuration and the output.

pe2600
2gb
2xcpu
perc4/di
6x73gb
slackware 10.0
kernel 2.6.9
xfs-filesystem on all partitions

for oracle i am using hugetlb:
/usr/bin/echo 360 > /proc/sys/vm/nr_hugepages

/dev/sda = 0+1 = raid1 = operating system
/dev/sdb = 2+3+4 = raid0 = oradata
/dev/sdc = raid0 = samba-fileserver

#top
top - 16:32:03 up 4 days, 22:20,  2 users,  load average: 0.26, 0.07, 0.08
Tasks: 101 total,   1 running, 100 sleeping,   0 stopped,   0 zombie
 Cpu0 :  0.0% us,  1.0% sy,  0.0% ni, 99.0% id,  0.0% wa,  0.0% hi,  0.0% si
 Cpu1 :  0.0% us,  2.0% sy,  0.0% ni, 94.1% id,  4.0% wa,  0.0% hi,  0.0% si
 Cpu2 :  2.0% us,  9.9% sy,  0.0% ni,  0.0% id, 83.2% wa,  1.0% hi,  4.0% si
 Cpu3 :  0.0% us,  2.0% sy,  0.0% ni, 92.2% id,  5.9% wa,  0.0% hi,  0.0% si
Mem:   2075688k total,  2065880k used,     9808k free,        0k buffers
Swap:  1992040k total,   724400k used,  1267640k free,   523232k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
31376 reichenb  15   0  3932 1844 3524 D  8.0  0.1   0:32.59 /usr/bin/mc -P /tmp/mc-reichenberg/mc.pwd.21286
   76 root      15   0     0    0    0 D  7.0  0.0   5:55.50 [kswapd0]
31485 root      16   0  1956 1044 1776 R  2.0  0.1   0:00.05 top
    1 root      16   0   480   76  456 S  0.0  0.0   0:01.23 init [3]


#df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda4              67G  4.8G   62G   8% /
/dev/sda1             278M   11M  268M   4% /boot
/dev/sdb1             205G   41G  164G  20% /mnt/oracle
/dev/sdc1              69G   61G  7.8G  89% /mnt/backup
tmpfs                1014M     0 1014M   0% /1

#free
             total       used       free     shared    buffers     cached
Mem:       2075688    1964920     110768          0          0     419648
-/+ buffers/cache:    1545272     530416
Swap:      1992040     718708    1273332

#swapon -s
Filename                                Type            Size    Used    Priority
/dev/sda2                               partition       996020  714808  -1
/dev/sda3                               partition       996020  0       -2

#vmstat 1
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 1  0 769280  82688      0 458912   20    9     2     7   22    12  0  0 99  1
 0  1 769280   6604      0 534528    0    0 40192    13 1690  1081  1  5 75 19
 1  1 769280  22300      0 518140    0    0 46848 22880 2024  6654  3  9 67 21
 0  1 769280  22480      0 517528    0    0 39168 28376 2272  5116  2  8 73 17
 0  2 769280   4624      0 535140    0    0 52096 29704 2228  5025  2 10 73 16
 0  2 769280  12552      0 527320    0    0 22144 58563 2368  3459  1  6 71 22
 2  0 769280   9352      0 530652    0    0  6784 81908 2582   847  1  3 75 21
 0  1 769280   7432      0 532624    0    0 64256     0 2064  7384  3 11 72 13
 1  0 769280  20920      0 519228    0    0 37504 12200 1848  5831  2  7 71 19
 0  2 769280   1464      0 538540    0    0 12160 91140 2552   542  1  4 72 23
 1  0 769280   3656      0 536636    0    0 40080 20752 2145  4895  2  8 73 17
 0  1 769280   5528      0 534732    0    0 54784  6392 2048  7360  2 11 70 16
 0  2 769280  23132      0 517256    0    0  9984 93188 2536  2306  0  5 72 23
 0  1 769280   5656      0 534596    0    0 53120  9920 2187  5367  3  9 73 15
 0  3 769280   8980      0 531332    0    0 60800  9272 2033  7214  3 11 71 15
 0  1 769280   7440      0 532760    0    0  3328 93862 2618   498  0  3 74 23
 0  1 769280   7320      0 532964    0    0 50968    33 1968  6397  3  9 73 16


MfG
Rico Reichenberg
GPG Public Key ID: 0xE7440BFF
----
KSU-Soft GmbH
http://www.ksu-soft.de
http://www.ksu-soft.de/ksuforum 
reichenberg at ksu-soft.de
Tel: 0395/4226918
Fax: 0395/4226919 
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