BIND 10 #1933: very high load and bad performance with REFUSED

[BIND 10 Development]

#1933: very high load and bad performance with REFUSED
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            Reporter:  jreed     |                        Owner:
                Type:  defect    |                       Status:  new
            Priority:  medium    |                    Milestone:  New Tasks
           Component:  b10-auth  |                     Keywords:
           Sensitive:  0         |              Defect Severity:  Medium
         Sub-Project:  DNS       |  Feature Depending on Ticket:
Estimated Difficulty:  0         |          Add Hours to Ticket:  0
         Total Hours:  0         |                    Internal?:  0
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 As seen in ticket #1932, all zones were refused due to an error in 1 out
 of 19 zones.

 Thsi was a very busy server getting around 17000 packets per second. With
 one auth server it could only send out around 1300 packets per second.
 When I added seven other auth servers it could send out 2600 packets per
 second. (8 CPU system.)

 The processes all had 100% CPU or very near.

 In most cases, my queries resulted in timeouts or in refused.

 Once the one zone was fixed and reconfigured (I set the file name to same
 file and ran config commit), the CPU load dropped to 33% for each b10-auth
 and the no more timeouts.

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Ticket URL: <http://bind10.isc.org/ticket/1933>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development