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Re: [DNSOP] New Version Notification for draft-wkumari-dnsop-hammer-00.txt

"John Levine" <johnl@taugh.com> Wed, 03 July 2013 21:02 UTC

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Date: Wed, 03 Jul 2013 21:01:47 -0000
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From: John Levine <johnl@taugh.com>
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Cc: paul.hoffman@vpnc.org
Subject: Re: [DNSOP] New Version Notification for draft-wkumari-dnsop-hammer-00.txt
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>>>    If yes, message cache elements are prefetched before they expire
>>>    to  keep  the  cache  up to date.  Default is no.  Turning it on
>>>    gives about 10 percent more traffic and load on the machine, but
>>>    popular items do not expire from the cache.

>My question earlier still stands: does Unbound do what HAMMER says
>(waits for a request before refreshing the cache) or does it just
>refresh the cache automatically? The Unbound doc is unclear (at least
>to me).

If it did it automatically, I'd expect a lot more than 10% more
traffic.  I enabled it on my not terribly busy server and I see
numbers that look like they're in the 1% range:

Jul 03 14:23:21 unbound[40669:0] info: server stats for thread 0: 47798 queries, 20108 answers from cache, 27690 recursions, 242 prefetch
Jul 03 15:23:21 unbound[40669:0] info: server stats for thread 0: 53322 queries, 20319 answers from cache, 33003 recursions, 291 prefetch
Jul 03 16:23:21 unbound[40669:0] info: server stats for thread 0: 55260 queries, 20697 answers from cache, 34563 recursions, 272 prefetch

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