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Re: Intel(r) Core?2 Duo Processors"



Dotan Cohen wrote:
On 13/10/06, John Wendel <john wendel metnet navy mil> wrote:
Tony Nelson wrote:
> At 12:28 AM +0200 10/13/06, Dotan Cohen wrote:
>> On 12/10/06, Tony Nelson <tonynelson georgeanelson com> wrote:
>>> I have a Athlon 1.2 GHz 512 MB and it is not slow on FC5, though I'm not >>> running the same mix as you are. I think possibly something is not right >>> on your system. Does top show a high load, or indicate that the system is >>> swapping? Perhaps the disks are fragmented -- EXT2/3 data structures don't
>>> suffer much from fragmentation, but the file data does.
>> This is top:
>>
>> top - 00:26:49 up 15:35,  1 user,  load average: 0.77, 0.61, 0.67
>
> Load seems low enough.
>
>> Tasks: 110 total,   1 running, 109 sleeping,   0 stopped,   0 zombie
>> Cpu(s): 2.7% us, 0.7% sy, 0.0% ni, 96.3% id, 0.0% wa, 0.3% hi, 0.0% si >> Mem: 1002168k total, 952200k used, 49968k free, 42264k buffers >> Swap: 1413648k total, 18460k used, 1395188k free, 575176k cached
>
> Not using much swap.
>
>>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>> 4433 root      15   0 98.6m  56m 4944 S  1.3  5.8 347:19.29 Xorg
>> 10572 dotancoh  16   0 32148  15m  11m S  1.0  1.6   0:01.07 konsole
>> 4829 dotancoh  15   0 25544 3684 1752 S  0.7  0.4   2:02.78 dcopserver
>> 5298 dotancoh  15   0 37460  22m  16m S  0.3  2.3   2:58.72 kicker
>> 10574 dotancoh  16   0  2192 1112  856 R  0.3  0.1   0:00.05 top
>>    1 root      16   0  1568  532  460 S  0.0  0.1   0:01.46 init
>> 2 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0 >> 3 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
>>    4 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 watchdog/0
>>    5 root      10  -5     0    0    0 S  0.0  0.0   0:01.34 events/0
>>    6 root      10  -5     0    0    0 S  0.0  0.0   0:00.02 khelper
>>    7 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 kthread
>>    9 root      10  -5     0    0    0 S  0.0  0.0   0:00.16 kblockd/0
>>   10 root      20  -5     0    0    0 S  0.0  0.0   0:00.00 kacpid
>>  105 root      15   0     0    0    0 S  0.0  0.0   0:00.24 pdflush
>>  106 root      15   0     0    0    0 S  0.0  0.0   0:00.76 pdflush
>>  108 root      18  -5     0    0    0 S  0.0  0.0   0:00.00 aio/0
>>
>> How can I check fragmentation. Googling the subject makes me beleive
>> that this is not the case in general with Linux.
>
> The common wisdom is that EXT2/3 are not affected by fragmentation, but
> without much real-world proof that this is so.  The EXT2/3 filesystem
> metadata was designed to be not much affected by fragmentation, but that > says little about the file data. I read an article / webpage (that I can't > find right now) by someone who decided to experiment with new and used EXT2 > filesystems, and found a substatial slowdown. He was inspired to try this > because he noticed that his computer sped up when given a fresh filesystem.
> You could try backing up and restoring to a fresh filesystem.  If you
> spring for a new computer you'll back up and restore to the new computer.
> Either way you'll get a fresh new filesystem.


Look at the Xorg Time. Doesn't 347:19.29 with an uptime of 15:35 seem
extremely high? On my box, X uses about 4 minutes / hour of uptime.

And the load averages on most of the desktops I use are mostly in the
0.1 - 0.3 range. This box has something eating CPU. I don't think the
file system is the problem.

Thanks, John. What would be a first good step to diagnos this?

Dotan Cohen

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I wish I had a good answer for you, since it's something I'd also like to know. I usually just look for busy processes with top or ps.

KDE has a performance tool (ksysguard) that is loaded with stuff (too much stuff). I'm sure Gnome has something equivalent. The problem is knowing what parts are interesting.

iostat, vmstat and sar are tools that might be useful, but the learning curve is a little steep.

Maybe a performance guru on the list could jump in with some help.

Regards,

John





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