[Tracker] Tracker is dropping the responsiveness of my desktop

[Mauro Carvalho Chehab <mchehab redhat com>]

Hi,

I have about 1.5 TB of disks here (2 SATA disks) on a high performance workstation
with 2 quad-core Xeon CPUs, 4-channel FB-DIMM rams and 3 heads using an ATI r600 GPU.

Since some time, I was experiencing very bad latency effects when using X11 applications.
> From time to time, all X applications used to pause their work during _several_ seconds.
It were affecting everything, including shells. I tried even to disable swap, as my first
suspect was that the system were doing too many swaps, as this machine only has 4GB ram,
but swap were not the cause of the issues.

The very high latency happens when very high disk I/O is produced, like when compiling
the Linux Kernel (using ccache).

Only today I finally discovered what application where hurting the system: tracker. After
removing tracker from my system (and deleting the 4GB tracker cache), my system is now 
working as expected.

I've no idea why tracker added so much performance penalties to my system, nor why
it was enabled on my system (I'm sure I never enabled it, as I don't even use Gnome
window manager here as xfce4 so far gave me the best results with 3 heads), but I'd
like to report you about those issues.

Thanks!
Mauro