[Click] Queues and notifications

[Eddie Kohler]

Clearly something is wrong with Click's notifications, with the number 
of people reporting problems, yet this config, with Queues instead of 
SimpleQueues, works for me!!

Anyone got any ideas?

Confused,
E


Mike Wilson wrote:
> I've got a large, complex click config where I read from UDP sockets and 
> write to a raw socket, routing packets from UDP tunnels.  Unfortunately, I 
> can't seem to get notifications working in the Queues.
> 
> I've stripped the config down to a fairly simple case that replicates the 
> problem, at least on my system.  If I use Queue or NotifierQueue 
> components for the queues, I either get nothing out the interface, or I 
> get 1-2 packets and then nothing.  If I use a SimpleQueue, everything 
> works just fine.
> 
> My limited understanding is that the SimpleQueue doesn't do notifiers, so 
> the pull components downstream must use polling.  In other words, it's a 
> massive CPU hog - I get 99% utilization to click with a SimpleQueue.  With 
> Queue, I don't even see click in my top(1) list.
> 
> Am I mis-using the queue components somehow, or is this a bug?  Do 
> RawSockets use notifiers?
> 
> -Mike Wilson
> 
> ---replication example---
> 
> // Warning, this config will send bogus UDP packets to 172.16.46.20.
> // Unfortunately, the problem doesn't manifest with a Discard at the end.
> 
> AddressInfo(myip  128.252.160.209,
>              NetRtr 172.16.46.12,
>              HostRtr 172.16.46.20,
>              NetRoute 172.16.46.0/24);
> 
> PortInfo(NetTun 0xA121,
>           HostTun 0xA122);
> 
> out :: RawSocket("UDP");
> rt :: RangeIPLookup(NetRoute  0, HostRtr 1);
> sched :: DRRSched();
> 
> TimedSource -> UDPIPEncap(HostRtr, 5005, HostRtr, 5005) -> 
> IPPrint("Injecting Packet") -> check :: CheckIPHeader;
> Idle -> rt;
> 
> check[1] -> Print("Injected Bad packet") -> Discard;
> check[0] -> IPPrint("Injected Valid Packet") -> GetIPAddress(16) -> rt;
> 
> rt[0] -> UDPIPEncap(myip, NetTun, NetRtr, NetTun) -> IPPrint("Net Route") 
> -> SimpleQueue -> [0]sched;
> rt[1] -> UDPIPEncap(myip, HostTun, HostRtr, HostTun) -> IPPrint("Host 
> Route") -> SimpleQueue -> [1]sched;
> 
> sched -> IPPrint("Sending") -> out;
> 
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