Re: ext3 performance issue with a Berkeley db application

["Stephen C. Tweedie" <sct redhat com>]

Hi,

On Tue, 2003-02-04 at 01:33, Matthias Andree wrote:

> > Stephen Tweedie has a loopback driver:
> > 	 http://people.redhat.com/sct/patches/testdrive/
> > which allows you to trace all I/O.

> How do I use that one? Load the module and then do a "regular" loopback
> mount?

Yep.  You need both the testdrive.o and the modified loop.o loaded, then
a simple "mount -o loop" will work.

> What's the physical unit of "frequency" for fault injection if I am to
> use this to test applications for robustness against EIO?

You can specify that --- see the MODULE_PARMs at the end of testdrive.c
for all the options.

Cheers,
 Stephen