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02-12-2007 01:27 AM
02-12-2007 01:27 AM
Possible Server Performance Issue
Facts
Red Hat Enterprise Linux AS release 4 (Nahant Update 1) 2.6.9-11.ELsmp
Symptom 1
dmesg reports
Losing some ticks... checking if CPU frequency changed.
Sympton 2
High CPU usage yet no apparent process seems to report the consumption, this is a weblogic server, interesting enough when you stop weblogic then the CPU load drops to minimal usage...
Yes you might say well its weblogic, but something in me says otherwise, but I have no logical facts... am i looking into this too much..
Appreciate any kind of help...
Though the server is experiencing CPU loads of 90 - 100% there is still plenty of memory available and swap is not even being touched..
This is a DL580 with 2 Intel(R) Xeon(TM) MP CPU 3.00GHz.. can anyone help me in resolving this ...
Much appreciated
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02-12-2007 02:16 AM
02-12-2007 02:16 AM
Re: Possible Server Performance Issue
And what does "cat /proc/cpuinfo" say ?
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02-12-2007 02:21 AM
02-12-2007 02:21 AM
Re: Possible Server Performance Issue
here is the cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) MP CPU 3.00GHz
stepping : 1
cpu MHz : 3001.341
cache size : 1024 KB
physical id : 0
siblings : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm pni monitor ds_c
pl est tm2 cid xtpr
bogomips : 5881.85
processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) MP CPU 3.00GHz
stepping : 1
cpu MHz : 3001.341
cache size : 1024 KB
physical id : 3
siblings : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm pni monitor ds_c
pl est tm2 cid xtpr
bogomips : 5980.16
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02-12-2007 02:22 AM
02-12-2007 02:22 AM
Re: Possible Server Performance Issue
--Steve
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02-12-2007 05:38 AM
02-12-2007 05:38 AM
Re: Possible Server Performance Issue
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02-12-2007 06:36 AM
02-12-2007 06:36 AM
Re: Possible Server Performance Issue
Will keep you posted...
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02-12-2007 09:40 AM
02-12-2007 09:40 AM
Re: Possible Server Performance Issue
Tells me that the Enhanced Intel Speedstep technology is supported, notice the est in the flags section, in /proc/cpuifo, but as you quite rightly said who's to say that it indeed works...
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02-13-2007 04:47 AM
02-13-2007 04:47 AM
Re: Possible Server Performance Issue
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02-13-2007 11:01 PM
02-13-2007 11:01 PM
Re: Possible Server Performance Issue
Here is my top listing...
top - 11:59:35 up 4:59, 5 users, load average: 7.45, 7.35, 6.67
Tasks: 105 total, 2 running, 103 sleeping, 0 stopped, 0 zombie
Cpu(s): 99.0% us, 0.4% sy, 0.0% ni, 0.4% id, 0.0% wa, 0.0% hi, 0.2% si
Mem: 4086548k total, 1682556k used, 2403992k free, 66844k buffers
Swap: 2031608k total, 0k used, 2031608k free, 444836k cached
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02-14-2007 08:11 AM
02-14-2007 08:11 AM
Re: Possible Server Performance Issue
To see if it is an instrumentation error, you may need to try some sort of soaker process and see how fast it runs after a boot, and then how fast it runs when the system is in this presented state. If the soaker runs as well as before, it suggests an instrumentation issue.
Perhaps a system-level profiler - I am more familiar with what one can run on Integrity boxes, but perhaps oprofile can do it and show where time is being spent as a sanity check.
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