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Re: ext3 blocks other with large writes



On Thu, 2002-02-28 at 18:44, Andreas Dilger wrote:
> On Feb 28, 2002  13:35 +0100, Diego SANTA CRUZ wrote:
> > However, I have observed that whenever something is doing a lot of
> > writing to an ext3 filesystem other processes that involves I/O on the
> > same disk are blocked for long times (often in the 10-30 secs range).
> > For example, if I cp a 1.5 Gb file from one ext3 partition to another
> > ext3 partition and I try to do ls on some dir, the ls usually blocks
> > between 10 and 30 secs before giving a response (the CPU usage is no
> > more than 10% during this). However if the destination partition for the
> > cp is mounted as ext2, the ls command responds almost immediately.
> 
> I don't think this is so much an ext3 problem as an elevator starvation
> problem.  You should try using Andrew's elevator starvation fix (sorry,
> don't know URL), which allows read requests to be put earlier in the
> queue so you don't get such long waits.
> 

Thanks for the tip, I actually suspected something like this. I suppose
it shows more with ext3 since it probably pushes the I/O system a little
harder than ext2.

Is the patch you mention the one at
http://www.uwsg.iu.edu/hypermail/linux/kernel/0201.0/1654.html ?

How stable is it, there was not much debate on l-k about it. Is it a
good sign?

Is that merged in any of the latest kernels?

Thanks for the help,

Diego

> Cheers, Andreas
> --
> Andreas Dilger
> http://sourceforge.net/projects/ext2resize/
> http://www-mddsp.enel.ucalgary.ca/People/adilger/
> 
> 
> 
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-- 
-------------------------------------------------------
Diego Santa Cruz
PhD. student
Publications available at http://ltswww.epfl.ch/~dsanta
Signal Processing Laboratory (LTS)
Swiss Federal Institute of Technology (EPFL)
EPFL - DE - LTS, CH-1015 Lausanne, Switzerland
E-mail:     Diego SantaCruz epfl ch
Phone:      +41 - 21 - 693 26 57
Fax:        +41 - 21 - 693 76 00
-------------------------------------------------------





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