DragonFly BSD
DragonFly bugs List (threaded) for 2006-03
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Re: (cache_lock diagnostics)

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 21 Mar 2006 10:08:32 -0800 (PST)

:This is a DFly 1.4.0 system (DragonFly 1.4.0-RELEASE (myhost) #3: Thu
:Jan 19 08:33:37 EST 2006) that is being used primarily as a spam
:filtering machine and, as such, sees some pretty high volume. About a
:week ago I started getting the following type of messages appearing in
:my logs and am wondering about a) the nature of the severity these
:represent b) the underlying cause and c) how to diagnose further.
:As a side note, this machine was upgraded from a 1.0 system and the
:ports replaced/upgraded using pkgsrc.

    As long as the machine doesn't deadlock in the name resolution code,
    the messages are harmless.  The messages are printed when the filename
    resolver blocks for more then one second and will occur more often on
    busy systems.

    I should probably change the default timeout.  You can adjust the
    default timeout with the debug.nclockwarn sysctl.  This value is in
    ticks so 100 = 1 second.  Try 500 (5 seconds).  The sysctl only effects
    the reporting of the warning.


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