Re: [hybi] Last Call: <draft-ietf-hybi-thewebsocketprotocol-10.txt> (The WebSocket protocol) to Proposed Standard

John Tamplin <jat@google.com> Mon, 25 July 2011 01:07 UTC

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From: John Tamplin <jat@google.com>
Date: Sun, 24 Jul 2011 21:06:37 -0400
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To: Mark Andrews <marka@isc.org>
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Subject: Re: [hybi] Last Call: <draft-ietf-hybi-thewebsocketprotocol-10.txt> (The WebSocket protocol) to Proposed Standard
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On Sun, Jul 24, 2011 at 8:46 PM, Mark Andrews <marka@isc.org> wrote:

> Adding a SRV lookup should add 0ms if it isn't there as you should be
> making A, AAAA and SRV lookups in parallel.  Non-existance is as
> cachable as existance is.
>

But you have to wait until the SRV returns even if the A/AAAA response comes
back first, so there is a non-zero cost even with an optimal implementation.
 I am not arguing whether the cost is worth the benefits, only that there is
a cost in any case.

-- 
John A. Tamplin
Software Engineer (GWT), Google