[Click] Queues and notifications

[Beyers Cronje]

Hi Mike,

Are you using the latest version from CVS?


On 1/25/07, Mike Wilson <mlw2 at arl.wustl.edu> 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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