03-06-2007
If a process is waiting for a resource it will almost always be asleep and will be woken by the kernel when the resource is available. CPU's do not simply run processes...it might be running kernel code to make those needed resources available. An idle CPU is looping repeatedly scanning the run queue looking for something to do... no other state is counted as idle.
The exception to sleeping for a resource is spinlocking...just looping until the resource is free (because the resource is expected to be locked very briefly). This happens in the kernel in an SMP environment. 16 cpus is a lot and you probably spend a fair amount of time spinlocked. Spinlocking if why you can't have unlimited numbers of cpu's on an SMP box...you reach a point where you spinlock too much.
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LEARN ABOUT XFREE86
noauth
NOAUTH(5) AFS File Reference NOAUTH(5)
NAME
NoAuth - Disables authorization checking
DESCRIPTION
The NoAuth file, if present in a server machine's /var/lib/openafs/local directory, indicates to the AFS server processes running on the
machine that it is not necessary to perform authorization checking. They perform any action for any user who logs into the machine's local
file system or issues a remote command that affects the machine's AFS server functioning, such as commands from the AFS command suites.
Because failure to check authorization exposes the machine's AFS server functionality to attack, there are normally only two circumstances
in which the file is present:
o During installation of the machine, as instructed in the OpenAFS Quick Start Guide.
o During correction of a server encryption key emergency, as discussed in the OpenAFS Administration Guide.
In all other circumstances, the absence of the file means that the AFS server processes perform authorization checking, verifying that the
issuer of a command has the required privilege.
Create the file in one of the following ways:
o By issuing the bosserver initialization command with the -noauth flag, if the Basic OverSeer (BOS) Server is not already running.
o By issuing the bos setauth command with off as the value for the -authrequired argument, if the BOS Server is already running.
To remove the file, issue the bos setauth command with "on" as the value for the -authrequired argument.
The file's contents, if any, are ignored; an empty (zero-length) file is effective.
SEE ALSO
bos_setauth(8), bosserver(8)
COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas
Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
OpenAFS 2012-03-26 NOAUTH(5)