[Netkit.users] First official release of Netkit-NG

Saverio Proto zioproto at gmail.com
Fri Jun 13 14:16:17 CEST 2014


I found the problem.

http://tldp.org/LDP/solrhe/Securing-Optimizing-Linux-RH-Edition-v1.3/chap6sec73.html

my home partition is NOT mounted with noatime

I just tried

chattr +A netkit-fs-i386-F7.0

saverio a nockid:~/netkit-ng/fs$ lsattr netkit-fs-i386-F7.0
-------A-----e- netkit-fs-i386-F7.0
saverio a nockid:~/netkit-ng/fs$


I started a machine with -W (Cow mode) and it is very fast now.

I will make more detailed tests later, but this looks like to be the problem.

Saverio



2014-06-13 14:03 GMT+02:00 Saverio Proto <zioproto a gmail.com>:
> I mean jbd2 is taking IO time on the host machine.
>
> Saverio
>
>
> 2014-06-13 13:10 GMT+02:00 Julien Iguchi-Cartigny
> <julien.iguchi-cartigny a lifl.fr>:
>> On 06/13/2014 01:07 PM, Saverio Proto wrote:
>>> Using iotop I see that the process that consumes all the IO time when
>>> the UML machines are very slow is:
>>>
>>> jbd2/sdb1-8
>>
>> jbd2 is now used (it is a fs system). I will try to build new images
>> this WE without it.
>>
>> Thanks for your feedback.
>>
>> J.
>>
>>
>>> I have this process using 99.99% IO time
>>>
>>> This is when the UML kernel needs to perform a disk write operation
>>>
>>> Saverio
>>>
>>>
>>> 2014-06-13 13:01 GMT+02:00 Saverio Proto <zioproto a gmail.com>:
>>>>> Could you precise if it's the I/O or the CPU use which seems slow ?
>>>>
>>>> Hello,
>>>> it is I/O problem. CPU is running low.
>>>>
>>>>> Could you describe your test computer architecture  (32/64 bits ?
>>>>> distribution ?) ?
>>>>
>>>> saverio a nockid:~$ cat /etc/issue
>>>> Ubuntu 12.04.4 LTS \n \l
>>>>
>>>> saverio a nockid:~$ uname -a
>>>> Linux nockid 3.2.0-58-generic #88-Ubuntu SMP Tue Dec 3 17:37:58 UTC
>>>> 2013 x86_64 x86_64 x86_64 GNU/Linux
>>>> saverio a nockid:~$ cat /proc/cpuinfo | head
>>>> processor    : 0
>>>> vendor_id    : GenuineIntel
>>>> cpu family    : 6
>>>> model        : 42
>>>> model name    : Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
>>>> stepping    : 7
>>>> microcode    : 0x17
>>>> cpu MHz        : 2400.000
>>>> cache size    : 8192 KB
>>>> physical id    : 0
>>>> saverio a nockid:~$
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>>
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