Hello,
I have worked lately on the patch that tries to mitigate one performance
problem in core:action.c file. I am talking about the multiple
calls to mk_proxy(), and the creation of temporary proxies for each
FORWARD_T action that the daemon executes.
I think this behaviour can be improved by caching certain proxies. My
idea is this:
* If the next_hop matches a name in the alias list (for example we
have an alias for example.com and the next_hop is proxy1.example.com),
then cache the proxy by calling add_proxy instead of mk_proxy. If the
proxy is already cached a pointer is returned, if not it is created and
added (the functionality already exists in proxy.c)
* For all other hosts a temporary proxy is made(same as now).
This whole logic can be turned off(default)/on by a parameter in .cfg.
I have run some tests and this can lead to big improvemets (because
mk_proxy mean some pkg_malloc - fast but also some DNS resolving -
slow). This might benefit some medium-large setups where you have some
servers forwarding request to other application servers, etc.
The patch is very small and it's already done and finished. I will
provide it tomorrow if somebody thinks this idea is good
Cheers
Marius
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