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https://issues.apache.org/jira/browse/DISPATCH-244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15985496#comment-15985496
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Chuck Rolke commented on DISPATCH-244:
--------------------------------------
Another problem most likely related to this issue is that a simple command like
_qdstat -l_ times out upon occasion. This is annoying but there are unusual
things going on inside the router when qdstat times out:
* One thread goes to 100% CPU. See attached file dispatch-144-gdb-backtrace.txt
for information.
* A network trace shows DNS trying to resolve my laptop host name.
* Perf analysis shows the thread consumed by libc-2.24.so sys_poll and related
functions. See file A-perf-flamegraph-3075-work.svg for a picture of the perf
sampling.
Note that the gdb, net trace, and perf snapshot were taken on three separate
runs so they will not correlate with each other.
> SASL library generates un-necessary DNS and LDAP requests
> ---------------------------------------------------------
>
> Key: DISPATCH-244
> URL: https://issues.apache.org/jira/browse/DISPATCH-244
> Project: Qpid Dispatch
> Issue Type: Bug
> Components: Tests
> Affects Versions: 0.5
> Reporter: Alan Conway
> Assignee: Alan Conway
>
> The dispatch system tests (e.g. system_tests_management) run very slowly when
> connected to a VPN.
> - about 10x slower on VPN configured to use TCP connection
> - about 5x slower on VPN configured for UDP connection
> Wireshark shows unexpected LDAP and DNS queries on the VPN interface.
> `wallace` below is the local host name, but is not mentioned in any tests so
> must be picked up by proton or dispatch at runtime:
> {code}
> 1 0.000000000 10.3.113.108 10.11.6.1 LDAP 242
> searchRequest(11) "dc=redhat,dc=com" wholeSubtree
> 2 0.035161000 10.3.113.108 10.5.30.160 DNS 72
> Standard query 0xd03f A wallace.lab.bos.redhat.com
> {code}
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