On Sun, Jul 24, 2011 at 8:46 PM, Mark Andrews <marka@xxxxxxx> 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
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