Re: Reiserfs concurrent write problems

[Chris Mason <mason@suse.com>]

On Mon, 2004-04-26 at 13:26, Bruce Guenter wrote:
> Greetings.
> 
> I have been running a series of custom benchmarks to see what
> filesystems perform best for a maildir-based mail server.
> 
> 	http://untroubled.org/benchmarking/2004-04/
> 
> So far, reiserfs has by far the best reading rate, but has serious
> problems when more than one writer is trying to fsync concurrently.
> Also, adding an external journal actually slows down the procedure
> instead of improving performance.  Are there any configuration changes
> or patches I should be trying to improve write performance?

Please try 2.6.6-rc2-mm2, which has new block allocator patches and
other speedups.

The default mount options should work best for you, but this might work
too:

mount -o alloc=skip_busy:dirid_groups /dev/xxx /mnt

Depending on the file size, 

mount -o notail can make a huge difference too.

-chris