Mailinglist Archive: opensuse (1986 mails)

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[opensuse] wait times excessive high {Suse 10.3 & 11}
  • From: "James D. Parra" <Jamesp@xxxxxxxxxxxxxxxx>
  • Date: Tue, 18 Nov 2008 16:42:40 -0800
  • Message-id: <531F1E080638384C9623B00D71AA546D0602BF6C@xxxxxxxxxxxxxxxxxxxxxxxxx>
Hello,

Trying to find why almost every process that requires IO has near 100% wait
times.

Even a simple 'cp' command has enormous wait times and doesn't appear at or
near the top of the list when running 'top'. This was occurring when
writing to a raid, but have tested writing to the system drive and the same
thing occurs.

Running the 'cp command copying a 19GB file from /tmp/file1 /tmp/file2 will
take 50 minutes

The same command on another identical system will take 10 minutes.

Any ideas on what could be causing this?

Top output when running cp;

top - 15:22:17 up 13 min, 2 users, load average: 7.28, 2.22, 0.79
Tasks: 162 total, 1 running, 161 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.3%sy, 0.0%ni, 0.3%id, 99.3%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni, 20.9%id, 79.1%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu2 : 0.0%us, 0.3%sy, 0.0%ni, 21.2%id, 78.5%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu3 : 0.0%us, 0.3%sy, 0.0%ni, 31.6%id, 68.1%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu4 : 0.0%us, 0.0%sy, 0.0%ni, 40.0%id, 60.0%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu5 : 0.0%us, 0.0%sy, 0.0%ni, 37.1%id, 62.9%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu6 : 0.0%us, 0.0%sy, 0.0%ni, 17.5%id, 82.5%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu7 : 0.0%us, 0.0%sy, 0.0%ni, 37.6%id, 62.4%wa, 0.0%hi, 0.0%si,
0.0%st
Mem: 33020488k total, 5782932k used, 27237556k free, 316k buffers
Swap: 8393952k total, 0k used, 8393952k free, 5562388k cached
<snip>

top - 15:28:05 up 18 min, 2 users, load average: 10.12, 7.39, 3.60
Tasks: 161 total, 1 running, 160 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.7%sy, 0.0%ni, 11.7%id, 87.7%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu2 : 0.0%us, 0.3%sy, 0.0%ni, 39.0%id, 60.7%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu3 : 0.0%us, 0.0%sy, 0.0%ni, 27.1%id, 72.9%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu4 : 0.0%us, 0.0%sy, 0.0%ni, 90.0%id, 10.0%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu5 : 0.0%us, 0.0%sy, 0.0%ni, 26.2%id, 73.8%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu6 : 0.0%us, 0.0%sy, 0.0%ni, 52.8%id, 47.2%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu7 : 0.0%us, 0.0%sy, 0.0%ni, 53.6%id, 46.4%wa, 0.0%hi, 0.0%si,
0.0%st
Mem: 33020488k total, 9431856k used, 23588632k free, 316k buffers
Swap: 8393952k total, 0k used, 8393952k free, 9154708k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 864 336 272 S 0 0.0 0:01.28 init
2 root 15 -5 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/0
4 root 15 -5 0 0 0 S 0 0.0 0:00.00 ksoftirqd/0
5 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/1
6 root 15 -5 0 0 0 S 0 0.0 0:00.00 ksoftirqd/1
7 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/2
8 root 15 -5 0 0 0 S 0 0.0 0:00.00 ksoftirqd/2
9 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/3
10 root 15 -5 0 0 0 S 0 0.0 0:00.00 ksoftirqd/3
11 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/4
12 root 15 -5 0 0 0 S 0 0.0 0:00.00 ksoftirqd/4
13 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/5
14 root 15 -5 0 0 0 S 0 0.0 0:00.00 ksoftirqd/5
15 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/6
<snip>

'cp' is not showing up, but it is running;

root 3915 0.2 0.0 8296 696 pts/0 D+ 15:20 0:02 cp file1
file2

Thank you,

James
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