[haiku-bugs] Re: [Haiku] #6073: GLTeapot Irregular FPS
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Tue, 25 May 2010 19:25:28 -0000
#6073: GLTeapot Irregular FPS
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Reporter: cb88 | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: - General | Version: R1/alpha2
Keywords: | Platform: All
Blockedby: | Patch: 0
Blocking: |
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Comment(by bonefish):
Replying to [comment:2 cb88]:
> This is a K10 laptop. ACPI is disabled...APM is on and I highly doubt
that it is overheating since it can get quite hot without downclocking
while running Linux though it could be inbuilt thermal protection I
*really* doubt this though since it wasn't hot at the time and is fairly
well ventilated and the fan has remained on low... I do not believe Haiku
supports K8/K10 power management either.
Note that there are a whole bunch of different power/thermal management
mechanisms. Some Intel processors -- I wouldn't be surprised, if AMD
implemented something similar (or even the same) -- sport automatic
thermal monitoring/protection. The CPU has one or more thermal sensors
which when certain (factory-set or software programmed) thresholds are
reached cause the CPU to modulate its clock duty cycle (i.e. keep the
frequency, but e.g. only work every other tick), reduce the frequency, or
even shut down completely. Depending on the processor model some of those
mechanisms can be programmed by software, but since Haiku doesn't do any
such thing, the CPU's default settings or whatever the BIOS set up will be
active when Haiku is running.
> If this is really what is happening it would seem it is not running @
2Ghz at all but only in the 1.4Ghz and 800Mhz states
>
> Is there a way to determine the current CPU frequency?
Nope, at least not for AMD CPUs.
--
Ticket URL: <http://dev.haiku-os.org/ticket/6073#comment:3>
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