On Tue, Nov 13, 2007 at 04:05:40PM +0100, Joerg Sonnenberger wrote:
> > The disk is part of the problem, at least with twa.  It seems the performance
> > collapses when the controller becomes real busy.  Even tw_cli (the 3ware cli
> > tool) starts to crawl when softdep is pushing data to disk.
> 
> In that case the driver can do that completely internal.

The same happens with regular disks, too (I have seen it many times before).

I talked to my hw dealer today and he said some kind of I/O throttling has
been implemented in linux to help with the same problem.

  -jm