[Click] Question regarding SetTXPower element usage.

[Kishore Ramachandran]

Hi All:

I would like to use this element but I cannot find documentation for the
same. Currently I am using it as follows:

SetTXPower(POWER a) where a is a constant between 0 and 63 (I looked at
the source code for this element and saw this range there).

However, when I observe the RSSI using a signal analyzer, there seems to
be no noticeable change. Am I using this correctly? Is there any
documentation for the same? What does this range correspond to?

My script (the one generated by madwifi-stripped/gen_config_ap.click with
the addition of this one line for SetTXPower) installs without complaints
and functions smoothly as well.

Thanks,
Kishore

On Mon, 29 Nov 2004, Beyers Cronje wrote:

> Hi all,
>
> I get an intermittend "Unable to handle kernel NULL pointer
> dereference" when using click-uninstall.
>
> Log file and running click config shown at the bottom.
> I'd say around 90% of the time click-uninstall works 100%.
>
> I'm running one custom element named "ipStats". Ive
> included the cleanup stage routines of this custom element.
> Am I not cleaning the hashmaps correctly or might this
> error be related to one of the other elements?
>
> Any ideas ?
>
> Kind regards
>
> Beyers Cronje
>
> ****Cleanup routines***************************
> int P2PStats::initialize(ErrorHandler *) {
> 		_tcp_gc_timer.initialize(this);
> 		_tcp_gc_timer.schedule_after_s(_tcp_gc_interval);
> 		_tcp_done_gc_timer.initialize(this);
> 		_tcp_done_gc_timer.schedule_after_s(_tcp_done_gc_interval);
>
> 		_map.set_arena(router()->arena_factory());
> 		return 0;
> };
>
> void IPStats::clean_map() {
> 		FlowInfo *fi;
>     for (Map::iterator iter = _map.begin(); iter; iter++)
> {	//Clean Flow map
> 	    fi = iter.value();
> 			if (fi != 0)
>       	delete fi;
>     };
> 		potential_supernodes.clear();
> 		for (Map::iterator iter = _to_clean_map.begin(); iter;
> iter++) {	//Clean any entries left in timedout or reset
> flows
> 				fi = iter.value();
> 				if (fi != 0)
> 						delete fi;
> 		};
> };
>
> void IPStats::cleanup(CleanupStage) {
>     clean_map();
> };
>
>
> *******Dump from log************************
> Nov 29 22:38:32 slump kernel: device eth0 entered
> promiscuous mode
> Nov 29 22:41:53 slump kernel: device eth0 left promiscuous
> mode
> Nov 29 22:41:53 slump kernel: Unable to handle kernel NULL
> pointer dereference at virtual address 00000003
> Nov 29 22:41:53 slump kernel:  printing eip:
> Nov 29 22:41:53 slump kernel: f89233b2
> Nov 29 22:41:53 slump kernel: *pde = 00000000
> Nov 29 22:41:53 slump kernel: Oops: 0000
> Nov 29 22:41:53 slump kernel: CPU:    0
> Nov 29 22:41:53 slump kernel: EIP:    0010:[<f89233b2>]
>    Not tainted
> Nov 29 22:41:53 slump kernel: EFLAGS: 00010297
> Nov 29 22:41:53 slump kernel: eax: fffffecf   ebx: 00000003
>   ecx: c0368d60   edx: f602b500
> Nov 29 22:41:53 slump kernel: esi: f5bc23a4   edi: f5bc2380
>   ebp: dacadf5c   esp: dacadd48
> Nov 29 22:41:53 slump kernel: ds: 0018   es: 0018   ss:
> 0018
> Nov 29 22:41:53 slump kernel: Process rmmod (pid: 31559,
> stackpage=dacad000)
> Nov 29 22:41:53 slump kernel: Stack: c017afcc 464c457f
> 00010101 00000000 00000000 00030003 00000001 00000b30
> Nov 29 22:41:53 slump kernel:        00000034 464c457f
> 00010101 00000000 00000000 00030003 00000001 80000b30
> Nov 29 22:41:53 slump kernel:        00000034 000125a8
> 00000000 00200034 00280003 000f0012 41ab8991 41ab8991
> Nov 29 22:41:53 slump kernel: Call Trace:    [<c017afcc>]
> [<c01388b5>] [<c01388b5>] [<c0136db3>] [<c012bbce>]
> Nov 29 22:41:53 slump kernel:   [<c012bf31>] [<c0130a05>]
> [<c012bcb0>] [<c0136db3>] [<c012bbce>] [<c012bf31>]
> Nov 29 22:41:53 slump kernel:   [<c01161e8>] [<f89bb373>]
> [<c016876a>] [<f89bb36d>] [<f89bb36d>] [<f89a69bc>]
> Nov 29 22:41:53 slump kernel:   [<c011cc43>] [<f89a3e77>]
> [<c011d2b1>] [<c011c536>] [<c010760f>]
> Nov 29 22:41:53 slump kernel:
> Nov 29 22:41:53 slump kernel: Code: 8b 1b 50 e8 26 7c 83 c7
> 83 c4 10 39 f3 75 e7 89 77 24 89 77
>
> ******Click config***********
>
> ip :: Strip(14)
>     -> MarkIPHeader
>     -> ipc :: IPClassifier(src net 196.0.0.0/8, dst net
> 196.0.0.0/8, -);
>     dialup :: ipStats;
>     lan :: ipStats;
>     ipc[0] -> [0]dialup;
>     ipc[1] -> [1]dialup;
>     dialup -> Discard;
>     ipc[2] -> ipc2 :: IPClassifier(src net 10.10.10.0/24,
> dst net 10.10.10.0/24, -);
>     ipc2[0] -> [0]lan;
>     ipc2[1] -> [1]lan;
>     lan -> Discard;
>     ipc2[2] -> Discard;
>
> unq :: Unqueue;
> // Input paths for eth0
> c0 :: Classifier(12/0800, -);
> fd :: FromDevice(eth0, PROMISC true, BURST 16);
> fd -> Queue(5000) -> unq -> c0;
> c0[0] -> ip;
> c0[1] -> Discard;
>
> td :: ToDevice(eth0);
> Idle -> td;
> ScheduleInfo(fd 1, td 0.1, ipStats 1, unq 1);
>
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