6.9 and latest module

Doesn't appear to affect it. Have verified that the cache router works. Currently am disabling this module except to get the statistics (since the other module's GUI isn't operational in 6.x yet). This works well and when the other module's set up is in effect can then disable it and run this one to see that the cache is being used in the way I expected (30%-90% hit rate) when (and only when) it (cache router) is enabled.

Perhaps you meant something other than the dropdown in the Performance admin panel. In any case confirmed by that by the procedure outlined above it has no effect. It's not that cache(s) are being cleared, they're not being used. Below shows the setup, with this module enabled. Update: changed below to show what needed to allow both to be enabled at the same time getting the working caching and the stats.

  $conf = array(
   // The path to wherever memcache.inc is. The easiest is to simply point it
   // to the copy in your module's directory.
   //'cache_inc' => './sites/all/modules/memcache/memcache.inc',
   //'cache_inc' => './sites/all/modules/memcache/memcache-session.inc',
   //   or
   // 'cache_inc' => './sites/all/modules/memcache/memcache.db.inc',
   	                      'memcache_servers' => array(
	      'localhost:11211' => 'default',
	      'localhost:11212' => 'page',
	      'localhost:11213' => 'content',
	      'localhost:11214' => 'sessions',
	      'localhost:11215' => 'users',
	      'localhost:11216' => 'menu'
	             ),
	    'memcache_bins' => array(
    'cache' => 'default',
    'cache_menu'   => 'menu',
    'cache_page'   => 'page',
    'cache_content' => 'content',
    'cache_sessions' => 'sessions',
    'cache_users' => 'users'
    ),
	'cache_inc' => './sites/all/modules/cacherouter/cacherouter.inc',
        'cacherouter' => array(
         'default' => array(
           'engine' => 'memcache',
           'server' => array('localhost:11211', 'localhost:11212', 'localhost:11213', 'localhost:11214', 'localhost:11215', 'localhost:11216' ),
           'shared' => TRUE,
           'prefix' => '',
           //'fast_cache' => TRUE,
        )),
 ); 

I am using memcache (and cache router). As noted, the use of this drupal module (for stats display only) is also accomplished by the configuration above (which ATM I am using for more fine grained caching but the module sharing is the same). The stats from the memcache api module show that caches are being used (in some cases with close to 100% hit rate). I will be verifying further but also am not getting the impact desired from caching so will want to look at addressing that as part of a solution to some other issues in my d6 projects. I am leaving this a bug report since SFAIK, without cacherouter or something else, the given procedures don't result in what the setup above shows, i.e. if I let memcache api be included instead of cache router, the memcache displays show that the caches are not being used. I'm more interested in the larger solutions mentioned though so others can give feedback on uncommenting the include commented out above. However I'm closing it; someone willing to track it can reopen/open their own.