On Tue, 12 Aug 2014, Alastair Scobie wrote:

> We did notice that when using DNS names in the URL, curl forks off a process
> to do the name lookup and then poll()s. There's no such fork when using an
> IP address in the URL. The poll() timesout after a period of time - we
> suspect this is the cause of the delay.

> (FYI - RHEL6 curl is 7.19, RHEL7 curl is 7.29)

I believe this is simply because Redhat switched their build to the threaded
resolver and in 7.29.0 we switched some libcurl internals which made us have
that performance issue. I think this problem is solved in a more recent
libcurl version.

-- 
  / daniel.haxx.se
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