linux migration/N high cpu consumption
on my linux appliance based on 3.0.0-14 kernel I got:
RPN:/tmp# ps axuf | grep migration
root 6 92.9 0.0 0 0 ? S Apr23 2788:33 _ [migration/0]
root 7 99.7 0.0 0 0 ? S Apr23 2993:20 _ [migration/1]
my top is
RPN:/tmp# top -b -n1
top - 12:03:41 up 2 days, 2:18, 5 users, load average: 25.76, 25.26, 24.73
Tasks: 171 total, 1 running, 168 sleeping, 0 stopped, 2 zombie
Cpu(s): 14.0%us, 12.6%sy, 0.8%ni, 72.0%id, 0.3%wa, 0.0%hi, 0.3%si, 0.0%st
Mem: 1543032k total, 1264728k used, 278304k free, 25308k buffers
Swap: 0k total, 0k used, 0k free, 183168k cached
My question: why processes "migration/N" take so much CPU?
linux cpu-usage
edited May 23 '12 at 9:53
Dan D.
4,68812838
asked Apr 25 '12 at 16:08
Alexander
2113
add a comment |
on my linux appliance based on 3.0.0-14 kernel I got:
RPN:/tmp# ps axuf | grep migration
root 6 92.9 0.0 0 0 ? S Apr23 2788:33 _ [migration/0]
root 7 99.7 0.0 0 0 ? S Apr23 2993:20 _ [migration/1]
my top is
RPN:/tmp# top -b -n1
top - 12:03:41 up 2 days, 2:18, 5 users, load average: 25.76, 25.26, 24.73
Tasks: 171 total, 1 running, 168 sleeping, 0 stopped, 2 zombie
Cpu(s): 14.0%us, 12.6%sy, 0.8%ni, 72.0%id, 0.3%wa, 0.0%hi, 0.3%si, 0.0%st
Mem: 1543032k total, 1264728k used, 278304k free, 25308k buffers
Swap: 0k total, 0k used, 0k free, 183168k cached
My question: why processes "migration/N" take so much CPU?
linux cpu-usage
edited May 23 '12 at 9:53
Dan D.
4,68812838
asked Apr 25 '12 at 16:08
Alexander
2113
Do you have any start-up tasks?
– evan.bovie
May 19 '12 at 5:35
add a comment |
on my linux appliance based on 3.0.0-14 kernel I got:
RPN:/tmp# ps axuf | grep migration
root 6 92.9 0.0 0 0 ? S Apr23 2788:33 _ [migration/0]
root 7 99.7 0.0 0 0 ? S Apr23 2993:20 _ [migration/1]
my top is
RPN:/tmp# top -b -n1
top - 12:03:41 up 2 days, 2:18, 5 users, load average: 25.76, 25.26, 24.73
Tasks: 171 total, 1 running, 168 sleeping, 0 stopped, 2 zombie
Cpu(s): 14.0%us, 12.6%sy, 0.8%ni, 72.0%id, 0.3%wa, 0.0%hi, 0.3%si, 0.0%st
Mem: 1543032k total, 1264728k used, 278304k free, 25308k buffers
Swap: 0k total, 0k used, 0k free, 183168k cached
My question: why processes "migration/N" take so much CPU?
linux cpu-usage
edited May 23 '12 at 9:53
Dan D.
4,68812838
asked Apr 25 '12 at 16:08
Alexander
2113
on my linux appliance based on 3.0.0-14 kernel I got:
RPN:/tmp# ps axuf | grep migration
root 6 92.9 0.0 0 0 ? S Apr23 2788:33 _ [migration/0]
root 7 99.7 0.0 0 0 ? S Apr23 2993:20 _ [migration/1]
my top is
RPN:/tmp# top -b -n1
top - 12:03:41 up 2 days, 2:18, 5 users, load average: 25.76, 25.26, 24.73
Tasks: 171 total, 1 running, 168 sleeping, 0 stopped, 2 zombie
Cpu(s): 14.0%us, 12.6%sy, 0.8%ni, 72.0%id, 0.3%wa, 0.0%hi, 0.3%si, 0.0%st
Mem: 1543032k total, 1264728k used, 278304k free, 25308k buffers
Swap: 0k total, 0k used, 0k free, 183168k cached
My question: why processes "migration/N" take so much CPU?
linux cpu-usage
linux cpu-usage
edited May 23 '12 at 9:53
Dan D.
4,68812838
asked Apr 25 '12 at 16:08
Alexander
2113
edited May 23 '12 at 9:53
Dan D.
4,68812838
asked Apr 25 '12 at 16:08
Alexander
2113
edited May 23 '12 at 9:53
Dan D.
4,68812838
edited May 23 '12 at 9:53
Dan D.
4,68812838
edited May 23 '12 at 9:53
Dan D.
4,68812838
4,68812838
asked Apr 25 '12 at 16:08
Alexander
2113
asked Apr 25 '12 at 16:08
Alexander
2113
asked Apr 25 '12 at 16:08
Alexander
2113
2113
Do you have any start-up tasks?
– evan.bovie
May 19 '12 at 5:35
add a comment |
Do you have any start-up tasks?
– evan.bovie
May 19 '12 at 5:35
Do you have any start-up tasks?
– evan.bovie
May 19 '12 at 5:35
Do you have any start-up tasks?
– evan.bovie
May 19 '12 at 5:35
add a comment |
2 Answers
2
active
oldest
votes
This appears to be a known bug. This openVZ forum post suggests to set the proc/sys/kernel/sched_cpulimit_nr_balance to 0.
# echo 0 > /proc/sys/kernel/sched_cpulimit_nr_balance
Which is a workaround you can use until a patch is released.
answered May 23 '12 at 8:55
Bram
577312
add a comment |
Compare CPU usage between.
top -b -n1 | grep migration
and
ps axuf | grep migration
Some 3.X.X.X kernel's have been known to report incorrect PS value's
edited Jul 18 '17 at 2:08
phuclv
8,93563789
answered May 22 '12 at 19:02
tao
1,295710
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
This appears to be a known bug. This openVZ forum post suggests to set the proc/sys/kernel/sched_cpulimit_nr_balance to 0.
# echo 0 > /proc/sys/kernel/sched_cpulimit_nr_balance
Which is a workaround you can use until a patch is released.
answered May 23 '12 at 8:55
Bram
577312
add a comment |
This appears to be a known bug. This openVZ forum post suggests to set the proc/sys/kernel/sched_cpulimit_nr_balance to 0.
# echo 0 > /proc/sys/kernel/sched_cpulimit_nr_balance
Which is a workaround you can use until a patch is released.
answered May 23 '12 at 8:55
Bram
577312
add a comment |
This appears to be a known bug. This openVZ forum post suggests to set the proc/sys/kernel/sched_cpulimit_nr_balance to 0.
# echo 0 > /proc/sys/kernel/sched_cpulimit_nr_balance
Which is a workaround you can use until a patch is released.
answered May 23 '12 at 8:55
Bram
577312
This appears to be a known bug. This openVZ forum post suggests to set the proc/sys/kernel/sched_cpulimit_nr_balance to 0.
# echo 0 > /proc/sys/kernel/sched_cpulimit_nr_balance
Which is a workaround you can use until a patch is released.
answered May 23 '12 at 8:55
Bram
577312
answered May 23 '12 at 8:55
Bram
577312
answered May 23 '12 at 8:55
Bram
577312
answered May 23 '12 at 8:55
Bram
577312
577312
add a comment |
add a comment |
Compare CPU usage between.
top -b -n1 | grep migration
and
ps axuf | grep migration
Some 3.X.X.X kernel's have been known to report incorrect PS value's
edited Jul 18 '17 at 2:08
phuclv
8,93563789
answered May 22 '12 at 19:02
tao
1,295710
add a comment |
Compare CPU usage between.
top -b -n1 | grep migration
and
ps axuf | grep migration
Some 3.X.X.X kernel's have been known to report incorrect PS value's
edited Jul 18 '17 at 2:08
phuclv
8,93563789
answered May 22 '12 at 19:02
tao
1,295710
add a comment |
Compare CPU usage between.
top -b -n1 | grep migration
and
ps axuf | grep migration
Some 3.X.X.X kernel's have been known to report incorrect PS value's
edited Jul 18 '17 at 2:08
phuclv
8,93563789
answered May 22 '12 at 19:02
tao
1,295710
Compare CPU usage between.
top -b -n1 | grep migration
and
ps axuf | grep migration
Some 3.X.X.X kernel's have been known to report incorrect PS value's
edited Jul 18 '17 at 2:08
phuclv
8,93563789
answered May 22 '12 at 19:02
tao
1,295710
edited Jul 18 '17 at 2:08
phuclv
8,93563789
edited Jul 18 '17 at 2:08
phuclv
8,93563789
edited Jul 18 '17 at 2:08
phuclv
8,93563789
8,93563789
answered May 22 '12 at 19:02
tao
1,295710
answered May 22 '12 at 19:02
tao
1,295710
answered May 22 '12 at 19:02
tao
1,295710
1,295710
add a comment |
add a comment |
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Do you have any start-up tasks?
– evan.bovie
May 19 '12 at 5:35