Re: Strange "flush" process bahaviour

[Vyacheslav Dubeyko <slava-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>]

Hi,

On Tue, 2012-11-13 at 00:19 +0400, fwdnilfsml.to.11df-2pMamKoQTv4@public.gmane.org wrote:
> Hello!
> Some time ago I've noticed, that "flush" kernel process associated with 
> device running nilfs2 filesystem, generate huge amount of IO activity 
> (using 100% CPU time). "iotop" utility show speeds about 5-15 GB\S on 
> that "flush" process, but no actual disk activity happens.

Sorry, but I have some misunderstanding. From one point of view, you
said that filesystem generates I/O activity but as a result you haven't
disk activity. Does it means that you create any files but you haven't
it on partition after umount?

> This condition lasts about 1-2 minutes, and then it stops for some time 
> (usually 10-20 minutes).
> 
> Is this a normal behavior ? I'm using kernel 3.6, and nilfs running on 
> luks-encrypted partitions, that belongs to software raid-1 array.
> 

Could you share more details about your configuration and situation?

Please, share:
1. System log content related to the problem (NILFS2, I/O subsystem).
2. Output of "top" and "ps -ax" in the case of the issue.
3. Describe your partitions and disks configuration ("mount" output,
"cat /proc/partitions" output).
4. Output of "lscp" and "lssu".

With the best regards,
Vyacheslav Dubeyko.

> //Sorry for my English
> 
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