[OpenIndiana-discuss] Problem with high cpu load (oi_151a)

Rennie Allen rennieallen at gmail.com
Thu Oct 20 21:45:25 UTC 2011


Sorry, I was away from my desk for a while.  Obviously this isn't an issue,
in fact, if anything, those numbers are surprisingly small.

On Thu, Oct 20, 2011 at 12:18 PM, Gernot Wolf <gw.inet at chello.at> wrote:

> Here are the results (let the script run for a few secs):
>
> CPU     ID                    FUNCTION:NAME
>  1      2                             :END      DEVICE           TIME (ns)
>      i9151              22111
>      heci0              23119
>   pci-ide0              38700
>      uhci1              47277
>   hci13940              50554
>      uhci3              63145
>      uhci0              64232
>      uhci4             103429
>      ehci1             107272
>      ehci0             108445
>      uhci2             112589
>    e1000g0             160024
>
> Regards,
> Gernot Wolf
>
>
> Am 20.10.11 20:22, schrieb Rennie Allen:
>
>> Try the following script, which will identify any drivers with high
>> interrupt load
>>
>> ---------------------
>> #!/usr/sbin/dtrace -s
>>
>> sdt:::interrupt-start { self->ts = vtimestamp; }
>> sdt:::interrupt-complete
>> /self->ts&&  arg0 != 0/
>>
>> {
>>         this->devi = (struct dev_info *)arg0;
>>         self->name = this->devi != 0 ?
>>             stringof(`devnamesp[this->**devi->devi_major].dn_name) : "?";
>>         this->inst = this->devi != 0 ? this->devi->devi_instance : 0;
>>         @num[self->name, this->inst] = sum(vtimestamp - self->ts);
>>         self->name = 0;
>> }
>> sdt:::interrupt-complete { self->ts = 0; }
>> dtrace:::END
>> {
>>         printf("%11s    %16s\n", "DEVICE", "TIME (ns)");
>>         printa("%10s%-3d %@16d\n", @num);
>> }
>> ---------------------
>>
>>
>>
>>
>>
>> On 10/20/11 11:07 AM, "Michael Stapleton"
>> <michael.stapleton@**techsologic.com <michael.stapleton at techsologic.com>>
>>  wrote:
>>
>>  That rules out userland.
>>>
>>> Sched tells me that it is not a user process. If kernel code is
>>> executing on a cpu, tools will report the sched process. The count was
>>> how many times the process was taken off the CPU while dtrace was
>>> running.
>>>
>>>
>>>
>>> Lets see what kernel code is running the most:
>>>
>>> #dtrace -n 'sched:::off-cpu { @[stack()]=count()}'
>>>
>>> #dtrace -n 'profile-1001 { @[stack()] = count() }'
>>>
>>>
>>>
>>> On Thu, 2011-10-20 at 19:52 +0200, Gernot Wolf wrote:
>>>
>>>  Yeah, I've been able to run this diagnostics on another OI box (at my
>>>> office, so much for OI not being used in production ;)), and noticed
>>>> that there were several values that were quite different. I just don't
>>>> have any idea on the meaning of this figures...
>>>>
>>>> Anyway, here are the results of the dtrace command (I executed the
>>>> command twice, hence two result sets):
>>>>
>>>> gernot at tintenfass:~# dtrace -n 'sched:::off-cpu { @[execname]=count()}'
>>>> dtrace: description 'sched:::off-cpu ' matched 3 probes
>>>> ^C
>>>>
>>>>    ipmgmtd                                                           1
>>>>    gconfd-2                                                          2
>>>>    gnome-settings-d                                                  2
>>>>    idmapd                                                            2
>>>>    inetd                                                             2
>>>>    miniserv.pl                                                       2
>>>>    netcfgd                                                           2
>>>>    nscd                                                              2
>>>>    ospm-applet                                                       2
>>>>    ssh-agent                                                         2
>>>>    sshd                                                              2
>>>>    svc.startd                                                        2
>>>>    intrd                                                             3
>>>>    afpd                                                              4
>>>>    mdnsd                                                             4
>>>>    gnome-power-mana                                                  5
>>>>    clock-applet                                                      7
>>>>    sendmail                                                          7
>>>>    xscreensaver                                                      7
>>>>    fmd                                                               9
>>>>    fsflush                                                          11
>>>>    ntpd                                                             11
>>>>    updatemanagernot                                                 13
>>>>    isapython2.6                                                     14
>>>>    devfsadm                                                         20
>>>>    gnome-terminal                                                   20
>>>>    dtrace                                                           23
>>>>    mixer_applet2                                                    25
>>>>    smbd                                                             39
>>>>    nwam-manager                                                     60
>>>>    svc.configd                                                      79
>>>>    Xorg                                                            100
>>>>    sched                                                        394078
>>>>
>>>> gernot at tintenfass:~# dtrace -n 'sched:::off-cpu { @[execname]=count()}'
>>>> dtrace: description 'sched:::off-cpu ' matched 3 probes
>>>> ^C
>>>>
>>>>    automountd                                                        1
>>>>    ipmgmtd                                                           1
>>>>    idmapd                                                            2
>>>>    in.routed                                                         2
>>>>    init                                                              2
>>>>    miniserv.pl                                                       2
>>>>    netcfgd                                                           2
>>>>    ssh-agent                                                         2
>>>>    sshd                                                              2
>>>>    svc.startd                                                        2
>>>>    fmd                                                               3
>>>>    hald                                                              3
>>>>    inetd                                                             3
>>>>    intrd                                                             3
>>>>    hald-addon-acpi                                                   4
>>>>    nscd                                                              4
>>>>    gnome-power-mana                                                  5
>>>>    sendmail                                                          5
>>>>    mdnsd                                                             6
>>>>    devfsadm                                                          8
>>>>    xscreensaver                                                      9
>>>>    fsflush                                                          10
>>>>    ntpd                                                             14
>>>>    updatemanagernot                                                 16
>>>>    mixer_applet2                                                    21
>>>>    isapython2.6                                                     22
>>>>    dtrace                                                           24
>>>>    gnome-terminal                                                   24
>>>>    smbd                                                             39
>>>>    nwam-manager                                                     58
>>>>    zpool-rpool                                                      65
>>>>    svc.configd                                                      79
>>>>    Xorg                                                             82
>>>>    sched                                                        369939
>>>>
>>>> So, quite obviously there is one executable standing out here, "sched",
>>>> now what's the meaning of this figures?
>>>>
>>>> Regards,
>>>> Gernot Wolf
>>>>
>>>>
>>>> Am 20.10.11 19:22, schrieb Michael Stapleton:
>>>>
>>>>> Hi Gernot,
>>>>>
>>>>> You have a high context switch rate.
>>>>>
>>>>> try
>>>>> #dtrace -n 'sched:::off-cpu { @[execname]=count()}'
>>>>>
>>>>> For a few seconds to see if you can get the name of and executable.
>>>>>
>>>>> Mike
>>>>> On Thu, 2011-10-20 at 18:44 +0200, Gernot Wolf wrote:
>>>>>
>>>>>  Hello all,
>>>>>>
>>>>>> I have a machine here at my home running OpenIndiana oi_151a, which
>>>>>> serves as a NAS on my home network. The original install was
>>>>>>
>>>>> OpenSolaris
>>>>
>>>>> 2009.6 which was later upgraded to snv_134b, and recently to oi_151a.
>>>>>>
>>>>>> So far this OSOL (now OI) box has performed excellently, with one
>>>>>>
>>>>> major
>>>>
>>>>> exception: Sometimes, after a reboot, the cpu load was about 50-60%,
>>>>>> although the system was doing nothing. Until recently, another reboot
>>>>>> solved the issue.
>>>>>>
>>>>>> This does not work any longer. The system has always a cpu load of
>>>>>> 50-60% when idle (and higher of course when there is actually some
>>>>>>
>>>>> work
>>>>
>>>>> to do).
>>>>>>
>>>>>> I've already googled the symptoms. This didn't turn up very much
>>>>>>
>>>>> useful
>>>>
>>>>> info, and the few things I found didn't apply to my problem. Most
>>>>>> noticably was this problem which could be solved by disabling cpupm
>>>>>>
>>>>> in
>>>>
>>>>> /etc/power.conf, but trying that didn't show any effect on my system.
>>>>>>
>>>>>> So I'm finally out of my depth. I have to admit that my knowledge of
>>>>>> Unix is superficial at best, so I decided to try looking for help
>>>>>>
>>>>> here.
>>>>
>>>>>
>>>>>> I've run several diagnostic commands like top, powertop, lockstat
>>>>>>
>>>>> etc.
>>>>
>>>>> and attached the results to this email (I've zipped the results of
>>>>>>
>>>>> kstat
>>>>
>>>>> because they were>1MB).
>>>>>>
>>>>>> One important thing is that when I boot into the oi_151a live dvd
>>>>>> instead of booting into the installed system, I also get the high cpu
>>>>>> load. I mention this because I have installed several things on my OI
>>>>>> box like vsftpd, svn, netstat etc. I first thought that this problem
>>>>>> might be caused by some of this extra stuff, but getting the same
>>>>>>
>>>>> system
>>>>
>>>>> when booting the live dvd ruled that out (I think).
>>>>>>
>>>>>> The machine is a custom build medium tower:
>>>>>> S-775 Intel DG965WHMKR ATX mainbord
>>>>>> Intel Core 2 Duo E4300 CPU 1.8GHz
>>>>>> 1x IDE DVD recorder
>>>>>> 1x IDE HD 200GB (serves as system drive)
>>>>>> 6x SATA II 1.5TB HD (configured as zfs raidz2 array)
>>>>>>
>>>>>> I have to solve this problem. Although the system runs fine and
>>>>>> absolutely serves it's purpose, having the cpu at 50-60% load
>>>>>>
>>>>> constantly
>>>>
>>>>> is a waste of energy and surely a rather unhealthy stress on the
>>>>>>
>>>>> hardware.
>>>>
>>>>>
>>>>>> Anyone any ideas...?
>>>>>>
>>>>>> Regards,
>>>>>> Gernot Wolf
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>>>>>>
>>>>>
>>>>>
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>>>>>
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