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List:       kfm-devel
Subject:    Re: Interesting thing with DNS requests
From:       "Maksim Orlovich" <mo85 () cornell ! edu>
Date:       2006-12-08 15:28:06
Message-ID: 10379.24.59.193.121.1165591686.squirrel () webmail ! cornell ! edu
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> Stephan Kulow wrote:
>>Am Donnerstag, 7. Dezember 2006 18:51 schrieb Thiago Macieira:
>>> If the server doesn't support connection keep-alive, you should fix
>>> it.
>>
>>Isn't fixing the web _and_ your DNS servers asked a bit too much?
>>
>>What is so problematic about implementing a DNS cache within KDE
>>if it turns out to be a problem for soo many people setting up one
>> correctly?
>
> Like I said, this was a very corner case: a webpage with 180 items on it,
> coupled with the absence of connection keep-alive, multiple webservers
> (including ads and that kind of stuff) and a slow DNS server.
>
> No wonder it was slow.

There are bug reports about this kind of stuff...

>
> I will not implement a global DNS cache on KDE because there already is a
> program that does that and for the whole system: nscd. Just install it.
> There is no need to import the nscd code into kded.

Are you sure a global cache is needed to help things? A per-slave cache
may be able to get much of the benefits, considering KIO tries to limit
the number of I/O slaves per process, even if it's something trivial like
a TTL of 30 seconds or such.

I am also very, very, concerned that some people suffer so badly due to
IPv6 support, which at the moment is basically just a geek feature, and
seems poorly supported by tons of DNS servers.

-Maks


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