https://bugzilla.novell.com/show_bug.cgi?id=421797
User alpha096@virginbroadband.com.au added comment
https://bugzilla.novell.com/show_bug.cgi?id=421797#c7
Scott Couston changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
--- Comment #7 from Scott Couston 2008-09-07 16:59:42 MDT ---
Both
Motherboards Different BIOS have a feature - which I assume is relevant to all
AMD X_64 bit processors - Called KoolnQuiet.
When this feature IS enabled the Kernel Will support CPU frequency changes,
however, is reality it initiates the CPU frequency in a retarded mode.
The CPU frequency will be changed by a combination of the BIOS and the Kernel,
however I fell, in all cases, this feature responds very poorly to CPU requests
and raised the frequency to normal CPU set tolerances.
Disabling this feature speeds up processing dramatically as the CPU never
remains massive frequency retardation.
In both Test cases CPU default frequency with BIOS option enabled is set to
14,400MHz on startup and will NOT move to its capacity or overclock until CPU
demands rise dramatically for a sustained period.
For example. With the KoolnQuiet frequency enabled booting the O/S will NOT
increase CPU frequency above 1,400Mkz and will remain at this setting.
The BIOS/CPU will NOT increase the frequency unless CPU demands remain at 100%
for almost 2 minutes + - 45seconds.
At this setting the Kernel will show frequency support at boot.
The conflict here is if disabled PC performs very very much better over any
demands of a session, however the kernel will not be enabled to slow or
overclock the frequency.
If the feature is enabled the PC starts at aprox 1,440MHz and remain there and
will NOT increase frequency until the performance requests are deemed too slow
by the BIOS/CPU. In practice this creates a disastrous expectation on total
performance, but the Kernel's attempt to alter CPU frequency ARE permitted.
I feel the function of increasing the CPU frequency ultimately rests with the
BIOS function and the Kernel's requests to raise it are hampered.
Conclusion:
The issue of the Kernel being permitted to influence the CPU frequency is only
permitted with KoolnQuiet is Enabled.
With KoolnQuiet Enabled the CPU provides an overall performance that is totally
unacceptable.
With KoolnQuiet Disabled the CPU provide the best overall performance and is
highly desirable.
Despite the disabling of KoolnQueit the CPU will continue to be cooled at the
most appropriate CPU cooling fan speed AND in a Disabled state will shutdown
the system on critical temperature of either CPU/RAM.
Bug Closed as invalid by reported as the Kernels ability to influence the CPU
frequency is governed by the BIOS/AMD feature of KoolnQuiet.
The KoolnQuiet BIOS feature seems to be present in ANY Motherboard and ANY BIOS
that supports AMD X_64 Bit Processors.
KoolnQuiet seems to be a function created by AMD with X_64 bit processors in
the
AMD Athlon(tm) 64 X2 Dual Core family.
I would encourage any other findings by other people to confirm the presence of
KoolnQuiet in different BIOS/CPU configurations other than the above where 3
separate BIOS's were tested with AMD Athlon Dual Core CPU's
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