From: Ted Zlatanov <tzz@lifelogs.com>
To: ding@gnus.org
Subject: Re: Asynchroneous image retrieval in HTML rendering
Date: Thu, 05 May 2011 08:51:47 -0500 [thread overview]
Message-ID: <87k4e5z24s.fsf@lifelogs.com> (raw)
In-Reply-To: <87tyd9jt0r.fsf@gmail.com>
On Thu, 05 May 2011 13:17:40 +0200 Antoine Levitt <antoine.levitt@gmail.com> wrote:
AL> 05/05/11 12:48, Ted Zlatanov
>> On Mon, 02 May 2011 19:40:43 +0200 Lars Magne Ingebrigtsen <larsi@gnus.org> wrote:
>>
LMI> The next thing to tackle is doing the DNS resolving asynchronously.
>> ...
LMI> If only somebody could implement an async C-level resolver. :-)
>>
>> On Thu, 05 May 2011 10:25:15 +0200 Julien Danjou <julien@danjou.info> wrote:
>>
JD> http://www.corpit.ru/mjt/udns.html
>>
>> On Wed, 04 May 2011 20:40:58 +0200 Simon Josefsson <simon@josefsson.org> wrote:
>>
SJ> http://www.chiark.greenend.org.uk/~ian/adns/
>>
>> Has anyone tested to see if DNS lookups are actually a problem? Test an
>> entirely local page vs. a page with lots of remote image URLs. I don't
>> see a difference on my machine.
AL> Maybe your connexion or DNS servers are better than mine, or some other
AL> parameter is different, but I definitely experienced freezes that were
AL> DNS-related. Lars also pointed out explicitely resolving the DNS in
AL> /etc/hosts sped things up immensely for gwene.com.wordpress.terrytao, so
AL> you could try this if you're not convinced by my admitedly
AL> non-repeatable arguments.
OK.
>> Typically DNS lookups are very fast and HTML pages don't have a huge mix
>> of domains for the images they reference, so I think this is wasted
>> effort *for the specific purpose of rendering HTML faster*. I can't
>> think of any practical uses within Emacs for async DNS lookups,
>> either.
AL> I don't know why, but DNS results don't seem to be cached. I don't know
AL> much about DNS queries so I'm not sure if that's supposed to be the case
AL> or not.
It's configurable and depends on the DNS records, but typically they
have a TTL of at least an hour.
On Thu, 05 May 2011 12:58:24 +0200 Julien Danjou <julien@danjou.info> wrote:
JD> I may be wrong, but I disagree: they are usually fast, except when there
JD> is a problem or you're behind a very slow link. Just because they are
JD> serialized and synchronous.
OK, I'll buy that (and Antoine's argument above).
JD> OTOH, I agree that the only useful place for this enhancement is
JD> probably HTML rendering…
There are some DNS-based anti-spam services but I can't think of
anything else that might require it.
Ted
next prev parent reply other threads:[~2011-05-05 13:51 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-23 22:18 Antoine Levitt
2011-04-28 20:03 ` Antoine Levitt
2011-04-29 9:04 ` Julien Danjou
2011-04-29 9:18 ` Antoine Levitt
2011-04-29 10:01 ` Julien Danjou
2011-04-29 20:34 ` Antoine Levitt
2011-05-01 15:13 ` Lars Magne Ingebrigtsen
2011-05-01 15:23 ` Antoine Levitt
2011-05-01 15:42 ` Lars Magne Ingebrigtsen
2011-05-01 16:06 ` Lars Magne Ingebrigtsen
2011-05-01 16:34 ` Adam Sjøgren
2011-05-01 16:45 ` Lars Magne Ingebrigtsen
2011-05-01 17:15 ` Antoine Levitt
2011-05-02 7:52 ` Antoine Levitt
2011-05-02 14:30 ` Lars Magne Ingebrigtsen
2011-05-02 14:53 ` Antoine Levitt
2011-05-02 15:17 ` Lars Magne Ingebrigtsen
2011-05-02 17:08 ` Lars Magne Ingebrigtsen
2011-05-02 17:24 ` Antoine Levitt
2011-05-02 17:40 ` Lars Magne Ingebrigtsen
2011-05-02 21:52 ` Antoine Levitt
2011-05-04 18:40 ` Simon Josefsson
2011-05-30 20:55 ` Lars Magne Ingebrigtsen
2011-05-05 8:25 ` Julien Danjou
2011-05-30 20:56 ` Lars Magne Ingebrigtsen
2011-05-05 10:48 ` Ted Zlatanov
2011-05-05 10:58 ` Julien Danjou
2011-05-05 11:17 ` Antoine Levitt
2011-05-05 13:51 ` Ted Zlatanov [this message]
2011-05-05 14:01 ` David Engster
2011-05-05 14:07 ` Julien Danjou
2011-05-05 15:05 ` Lars Magne Ingebrigtsen
2011-05-05 19:49 ` David Engster
2011-05-05 20:07 ` Lars Magne Ingebrigtsen
2011-05-05 14:25 ` David Engster
2011-05-05 14:34 ` Antoine Levitt
2011-05-05 14:59 ` David Engster
2011-05-05 15:00 ` David Engster
2011-05-02 17:53 ` Lars Magne Ingebrigtsen
2011-05-02 18:18 ` Lars Magne Ingebrigtsen
2011-05-02 17:12 ` Ted Zlatanov
2011-05-02 17:20 ` Lars Magne Ingebrigtsen
2011-05-02 21:18 ` Steinar Bang
2011-05-02 22:40 ` Lars Magne Ingebrigtsen
2011-05-03 14:09 ` Ted Zlatanov
2011-05-03 18:48 ` Steinar Bang
2011-05-02 21:15 ` Steinar Bang
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