Am Mittwoch, 27. Juni 2007 14:34 schrieben Sie:

* Manfred Gruber [off-list ref] wrote:

quoted

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

ok, thanks without SLAB_DEBUG there is no poison_obj latency.

-- 
mfg
	Manfred Gruber