performance myth: DNS performance

myth:
the DNS system performs well
data:
error taxonomy
bogus A queries to root name servers for a few hours at f-root in 2001
A queries ask for the IP address of a hostname 
not supposed to be 'in theory'
malformed A queries were 14% of the load at F.root
guilty: microsoft: Win2k resolver, viruses (win95/98/nt), macOSX resolver
asking for the IP address of an IP address
20% of queries asking for non-existent TLD
lots of internal microsoft names (active directory) 
lots ending in .local, .localhost, .workgroup, .msft, .domain, etc. 
hard to track down, nameservers just relay clients queries 
cannot see back to the actual client that asked the question