Re: ext3 performance issue with a Berkeley db application

[Andreas Dilger <adilger clusterfs com>]

On Feb 03, 2003  12:08 +0100, Matthias Andree wrote:
> Are you aware of a module that applies to recent kernel versions and
> that traces block numbers of ll_rw_block()? It might turn up some useful
> information -- then we'd easier know the ext3 "output" to the hard disk;
> we already know the "input" from the application at the syscall level.

Stephen Tweedie has a loopback driver:

	 http://people.redhat.com/sct/patches/testdrive/

which allows you to trace all I/O.

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/