On Sun, Jul 24, 2011 at 8:46 PM, Mark Andrews <[email protected]> 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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