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List:       kfm-devel
Subject:    Re: Interesting thing with DNS requests
From:       Thiago Macieira <thiago () kde ! org>
Date:       2006-12-07 17:51:59
Message-ID: 200612071851.59792.thiago () kde ! org
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Mario Weilguni wrote:
>I still think DNS caching in kio might be necessary. Long ago, I had the
> same problem with a page with many pictures on it, and konquerer did
> way too much DNS lookups.
>
>Of course this is a problem, even a small latency of 30ms for a DNS
> lookup will be noticeable if 650 requests are going over the wire.

I disagree. I will not implement such feature.

If you have a webpage that downloads 650 items from 650 different 
webservers, you deserve to be shot.

On the other hand, if it's from the same webserver, kio_http should be 
keeping the connection alive and do a total of 5 lookups. If the server 
doesn't support connection keep-alive, you should fix it.

0.5 ms name-lookup latency + 100 ms TCP connect latency for 650 items is 
way too much.

(Yes, 0.5 ms. If yours takes 30 ms, it's too slow)
-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
    PGP/GPG: 0x6EF45358; fingerprint:
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