Re: Pause intervals when copying/extracting an archive

[Ryusuke Konishi <ryusuke-sG5X7nlA6pw@public.gmane.org>]

Hi,
On Sat, 16 May 2009 20:15:55 +0300, nezmer-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> Hi ,
> 
> Kernel : 2.6.30-rc5-git3 .
> nilfs2 partition : 1GB USB flash disk .
> 
> I have a rar archive with 10 mp3 files in it . When I copy this file to
> a nilfs2 partition the progress pauses(freezes) in certain intervals .
> the same thing happens when I try to extract the archive . this 'bug'
> causes the extraction time to jump from <2s (ext4,JFS,XFS) to 29s in
> nilfs2 . Those intervals are 100% reproducible here . 
> 
> I have no idea how to get a detailed log of what's going on with nilfs2 . So If you need that log , Just tell me how can I get it .
> 
> Estimated calculation of pause intervals in MB :
> 
> unrar e file.rar #(60.5MB)
> 12.732
> 28.52
> 42.028
> 56.768
> 
> cp file.rar /media/nilfsTest/
> 14.1
> 28.1
> 42.2
> 56.2

Thank you for reporting the problem.  I'll look into this along with
the reported mount problem on pen-drives.

If you can hit the keyboard in another terminal during the interval,
please try the following dump feature:

 # echo 1 > /proc/sys/kernel/sysrq

 # echo d > /proc/sysrq-trigger
 # dmesg > dmesg.out.1
 (this shows all locks that are held)

 # echo t > /proc/sysrq-trigger
 # dmesg > dmesg.out.2
 (this will dump a list of current tasks and their stack)


Note that, your kernel has to be built with the kernel option:

  CONFIG_MAGIC_SYSRQ=y

to enable this feature.


Thanks,
Ryusuke Konishi