I don't know about GUI or kernel specific testing, but I've used 
iometer before.
http://sourceforge.net/projects/iometer/
As you might suspect from the name, it pretty much tests I/O (disk and 
network), but if you set things up right you can give your system a 
pretty good workout in the process.

On Monday, June 30, 2003, at 09:53  AM, Sadanapalli, Pradeep Kumar 
(MED, TCS) wrote:

> Hi,
> we have customized the redhat kernel and built a customized Red Hat
> Linux Workstation with KDE&GNOME for the employees. Now, I am looking 
> at
> testing the workstation. Can anyone suggest me how to go about
> Load-Testing of Linux System in whole, Load-Testing of Kernel, Load
> Testing of GUI(KDE&GNOME) ...I mean Performance testing to be
> specific....? Any useful links? Are there any standard procedures for
> testing or any tools to carry out this ? Any help is greatly
> appreciated...
>
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> http://www.mn-linux.org tclug-list at mn-linux.org
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