[Solution] Re: [sldev] Linux 64 bit framerate stutter (0.5 - 2.0 second frame periodically [every 5 to 60 seconds])

[Bane Darrow]

I've further investigated this and now have it solved. It's actually not
quite all there is to it.

The first step is indeed to compile in libcares support. That gets me
non-blocking DNS queries, but researching further, there are other
conditions that libcurl will operate in a blocking mode.

http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/libcurl-multi.3.html

That page at the end explains it well.

libcurl can be compiled with various options, and I was compiling without
cares and with gnutls. Reading this thread made me find the cares issue, so
I compiled libcurl with that. But the final blocking was the gnutls support.
Removing that to use OpenSSL cleared up my stutters.

For gentoo developers doing the standalone build, make sure youre USE flags
(at least for curl) are +ares, +ssl, and -gnutls.

Thanks for the help.


On Fri, Mar 14, 2008 at 11:22 AM, Bryan O'Sullivan <bos at lindenlab.com>
wrote:

> Robin Cornelius wrote:
>
> > I agree its a curl function and i got a back trace into it too :-
>
> I commented on the JIRA task.  Normally, libcurl should be using
> libcares to perform DNS queries in a non-blocking manner.  For some
> reason, the libcurl you're using isn't configured to do that, and it's
> calling into the regular resolv routines instead.  That's definitely the
> source of your problem.
>
>        <b
>
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