Daniel-Constantin Mierla wrote:
Hello,
On 1/22/10 3:31 PM, Ovidiu Sas wrote:
The way that the original module was written did not allow dynamic numbers of queues and pipes. I am using the ratelimit module to control incoming/outgoing traffic on specific trunks by invoking rate limitation based on pipes (by forcing a specific pipe). Choosing a specific pipe is up to the kamailio config designer (any type of operations ca be applied to the pvar before choosing a specific pipe, so IMHO it is pretty flexible as is right now - one can apply any regex operations to a pvar). Pipes and queues can be dynamically modified via mi commands. The major limitation of the module is the hard coded number of queues and pipes and the fact that dynamic changes to pipes and queues are not saved on restart.
Loading the queues and pipes from a db will require a redesign of how the pipes and queues are stored internally.
yes, it is a hash table. A benefit of dynamic/dynamic names is you can simply use ip address as pipe name. Also strings tend to look more meaningful when coming back to a config after some time :-) .
IIRC, one issue with the old design is using single lock for all pipes. The advantage was using static indexing, therefore faster access (still under one lock). The new one has a lock per slot, so there can be quite some parallelism of updates/checks, therefore overall could be same results, tending to be faster with old for low number of pipes and not so heavy traffic, better with lot of pipes and lot of traffic.
On the other hand, I find useful what Marius proposed as new features.
Cheers, Daniel
Hello,
I saw the pipelimit commit, and I am going to have a look to better understand the design. The first question is about the new pipelimit module... Does it require(as in it's a must) a working DB connection to get the pipe configuration ? Because this could be a problem for some systems, (like a light stateless proxy in front of other machines) because this will mean the requirement of loading a DB module. If there is indeed the need for a database, than I suggest that we still allow cfg configuration , will the limitation that runtime changes aren't permanent and are lost in case of a restart.
Regarding the static indexing versus dynamic allocation of pipes, I was thinking that most setups only need a few pipes and that number doesn't change very often. With this in mind I was thinking about combining the two approaches: start to a low number of pipes (16 for example which is basicaly an array on the stack or continuous allocation on the heap). In case of need of a 17th pipe double the capacity (allocate a 32 continuous array on the heap ) and deep copy the old 16 pipes (something that std::vector in c++ does when we alter its capacity). This will add the advantage on using static indexing but still provide with the new functionality of a variable number of pipes.
What do you think?
Greetings, Marius