The variable "table_cache" is deprecated, use the new name "table_open_cache" instead.

Thanks to Ivoz for pointing this out.

debian/additions/my.cnf

@@ -65,7 +65,7 @@ max_heap_table_size	= 32M
 myisam_recover          = BACKUP
 key_buffer_size		= 128M
 #open-files-limit	= 2000
-table_cache             = 400
+table_open_cache	= 400
 myisam_sort_buffer_size	= 512M
 concurrent_insert	= 2
 read_buffer_size	= 2M