Bug 64499 - bind 9 is unresponsive on high load.
bind 9 is unresponsive on high load.
Product: Red Hat Linux
Classification: Retired
Component: bind (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Daniel Walsh
Ben Levenson
Depends On:
  Show dependency treegraph
Reported: 2002-05-06 17:00 EDT by Costa Tsaousis
Modified: 2016-10-10 10:09 EDT (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2003-01-16 15:59:07 EST
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
oVirt gerrit 64499 ovirt-4.0 MERGED virt: Don't crash in migration progress on compression bytes 2016-10-03 10:01 EDT
oVirt gerrit 65306 ovirt-4.0.5 MERGED virt: Don't crash in migration progress on compression bytes 2016-10-11 07:54 EDT

  None (edit)
Description Costa Tsaousis 2002-05-06 17:00:48 EDT
From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Q312461; .NET 
CLR 1.0.3705)

Description of problem:
When operating bind9 as a caching name server on a network where there are 
thousands of concurrent requests, bind9 shipped with RH7.2 gets unresponsive 
without utilizing all system resources (network, CPU, Memory).
I have confirmed this in a lab.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
Send a few thousand concurrent requests to bind9.

Actual Results:  bind responds to very few requests, network and CPU are 
alsmost completely idle, there is plenty of free RAM, UDP reveice queue fills 
up completely (65k).

Expected Results:  Consume all available system resources, then fill the UDP 
queue and loose requests.

Additional info:
I have sent this request to bind9 mailing list and received an answer that I 
should compile bind9 without threads. Read it at:

I have confirmed that by re-compiling bind9 without threads the problem does 
not exist: bind9 consumes all available system resources before filling up the 
UDP receive queue and loosing requests.
Comment 1 Daniel Walsh 2003-01-16 15:59:07 EST
We believe that the new thread libraries might fix this.  Could you attempt it
using one of the 8.1 betas?

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