* Manfred Gruber [off-list ref] wrote:

hi !

I use a arm4vt ep93xx processor with 2.6.21.5-rt18. 
When i run cyclictest with -i 10000 and -n -p 90 -b 1000 i see some strange 
latencies in poison_obj.

disable SLAB_DEBUG. And look into your 'dmesg' output, the -rt kernel 
will warn about any other kernel config options as well that are known 
to cause large latencies:

VFS: Mounted root (ext3 filesystem) readonly.
*****************************************************************************
*                                                                           *
*  REMINDER, the following debugging option is turned on in your .config:   *
*                                                                           *
*        CONFIG_SLAB                                                        *
*                                                                           *
*  it may increase runtime overhead and latencies.                          *
*                                                                           *
*****************************************************************************
Freeing unused kernel memory: 324k freed

	Ingo