47690634f1
When validating insecure delegations we don't actually need to request the SOA for every single dns label. We need the DS records for the zone, and we can seek them by querying for DS directly (in case we are at a zone cut) and then following the SOA referrals or the parent name until we have found a chain of trust. Extra transactions and roundtrips, especially transactions for RRs that aren't actually needed to validate and therefore aren't likely to be in the recursive resolver's own cache are a big slowdown during validation. Consequently, this change results in an enourmous speed up in validating most names from our own cold-cache (10x or more), by eliminating a large number of superfluous dnssec transactions.
System and Service Manager
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